Tutorial

Follow the steps in this tutorial to integrate a web application with the Google Pay API, and to configure it to accept payment cards.

Step 1: Define your Google Pay API version.
Step 2: Choose a payment tokenization method.
Step 3: Define supported payment card networks.
Step 4: Describe your allowed payment methods.
Step 5: Load the Google Pay API JavaScript library.
Step 6: Determine readiness to pay with the Google Pay API.
Step 7: Add a Google Pay payment button.
Step 8: Create a PaymentDataRequest object.
Step 9: Register an event handler for user gestures.
Step 10 (optional): Set up Authorize Payments.
Step 11 (optional for shipping enabled): Set up Dynamic Price Updates.
Step 12 (optional for promo codes): Set up Promo Codes.
Put it all together.
Note: See our live Google Pay demo.

Step 1: Define your Google Pay API version

Declare the version of the Google Pay API that your site uses. The major and minor versions are required in the fields of each passed object, and are included in the response.

The following code sample shows declared API versions:

const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

Step 2: Request a payment token for your payment provider

Google encrypts information about a payer's selected card for secure processing by a payment provider.

const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

Replace example and exampleGatewayMerchantId with the appropriate values for your payment provider. Use the following table to find the specific gateway and gatewayMerchantId values for your payment provider:

Gateway	Parameters and documents
ABA PayWay	"gateway": "ababank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
accept.blue	"gateway": "acceptblue" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ACI	"gateway": "aciworldwide" "gatewayMerchantId": "`YOUR_ENTITY_ID`" Developer docs
ACpay	"gateway": "acpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Acquired.com	"gateway": "acquired" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Adyen	"gateway": "adyen" "gatewayMerchantId": "`YOUR_MERCHANT_ACCOUNT_NAME`" Developer docs
Airba Pay	"gateway": "airbapay"" "gatewayMerchantId": "`YOUR_MERCHANT_ACCOUNT_NAME`" Developer docs
Airvend	"gateway": "airvend" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Airwallex	"gateway": "airwallex" "gatewayMerchantId": "`YOUR_MERCHANT_ACCOUNT_NAME`" Developer docs
Akurateco	"gateway": "akuratecolab" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Alfa-Bank	"gateway": "alfabank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Algoritma	"gateway": "algoritma" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Allinpay	"gateway": "allinpayintl" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
AllPayments	"gateway": "allpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
alticepay	"gateway": "alticepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Anedot	"gateway": "anedot" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ApcoPay	"gateway": "apcopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
APPEX	"gateway": "epos" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
AsiaBill	"gateway": "asiabill" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Assist	"gateway": "assist" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Assist Belarus	"gateway": "belassist" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Assist Kazakhstan	"gateway": "assistkz" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Aurus	"gateway": "auruspay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Axerve	"gateway": "gestpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Bank 131	"gateway": "bank131" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Bank Vostok	"gateway": "bankvostok" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Barclaycard	"gateway": "barclayssmartpayadvance" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Barion	"gateway": "barion" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
BCC.KZ	"gateway": "bccpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
bePaid	"gateway": "ecomcharge" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Bereke Bank	"gateway": "berekepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Billing Systems	"gateway": "billingsystems" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Bizzon	"gateway": "bizzon" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Blocks	"gateway": "blocks" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Bluefin	"gateway": "bluefin" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Blue Media	"gateway": "bluemedia" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
BlueSnap	"gateway": "bluesnap" "gatewayMerchantId": "`YOUR_shopToken`" Developer docs
BPC	"gateway": "bpcpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
BR-DGE	"gateway": "comcarde" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Braintree	"gateway": "braintree" "braintree:apiVersion": "v1" "braintree:sdkVersion": "braintree.client.`VERSION`" "braintree:merchantId": "`YOUR_BRAINTREE_MERCHANT_ID`" "braintree:clientKey": "`YOUR_BRAINTREE_TOKENIZATION_KEY`" Developer docs
Braspag	"gateway": "cielo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
BridgerPay	"gateway": "bridgerpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
BT Pay	"gateway": "btpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Buya	"gateway": "buya" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CardCom	"gateway": "cardcom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CardConnect	"gateway": "cardconnect" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cardknox	"gateway": "cardknox" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cardstream	"gateway": "crst" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cashflows	"gateway": "cashflowsgateway" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cathay United Bank	"gateway": "cathaybk" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CCAvenue UAE	"gateway": "ccavenueuae" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cecabank	"gateway": "cecabank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Celerispay	"gateway": "celerispay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CentralPay	"gateway": "centralpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Chargehive	"gateway": "chargehive" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CharityEngine	"gateway": "charityengine" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Chase Merchant Services	"gateway": "chase" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Checkout.com	"gateway": "checkoutltd" "gatewayMerchantId": "`YOUR_PUBLIC_KEY`" Developer docs
CityPay	"gateway": "citypay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cloud9 Payment Gateway (C9PG)	"gateway": "c9pg" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CloudPayments	"gateway": "cloudpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CloudWalk	"gateway": "cloudwalk" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Computop	"gateway": "computop" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ConcordPay	"gateway": "concordpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Connectum	"gateway": "connectum" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ConnexPay	"gateway": "connexpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Corefy	"gateway": "paycoreio" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Corvus Pay	"gateway": "corvuspay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Credorax	"gateway": "credorax" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CrossPay	"gateway": "crosspay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CSG Forte	"gateway": "csgforte" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CTBC Bank	"gateway": "ctbcbank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CURO Payments	"gateway": "curopayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
CYBERBIZ	"gateway": "cyberbizpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Cybersource	"gateway": "cybersource" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
danube.pay	"gateway": "danubepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Datacap Systems, Inc.	"gateway": "datatrans" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Datatrans	"gateway": "datatrans" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
DECTA	"gateway": "decta" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs
Deutsche Bank AG	"gateway": "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs
Deutsche Bank – Merchant Solutions	"gateway": "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
DG Financial Technology, Inc.	"gateway": "veritrans" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Digital Finance	"gateway": "digitalfinance" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
dLocal	"gateway": "dlocal" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
DNA Payments	"gateway": "dnapayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Dojo	"gateway": "dojo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Dotpay	"gateway": "dotpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
e-SiTef - Software Express	"gateway": "softwareexpress" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
easycard	"gateway": "easycard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
EasyPay	"gateway": "easypay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
EBANX	"gateway": "ebanx" "gatewayMerchantId": "`YOUR_PUBLIC_INTEGRATION_KEY`" Developer docs
eCard	"gateway": "ecard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ECOMMPAY	"gateway": "ecommpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Ecopaynet	"gateway": "ecopaynet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ECPay	"gateway": "ecpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
eGHL	"gateway": "eghl" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Elavon (Converge)	"gateway": "convergepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Emerchantpay	"gateway": "emerchantpay" "gatewayMerchantID": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
emspay	"gateway": "emsonline" "gatewayMerchantID": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Encoded	"gateway": "encoded" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
EpicPay	"gateway": "epicpay" "gatewayMerchantID": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Espago	"gateway": "espago" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
EveryPay	"gateway": "everypay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
EVONET	"gateway": "cardinfolink" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Evopay	"gateway": "evopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Evo Payment Gateway	"gateway": "evopaymentgateway" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
exactly.com	"gateway": "exactly" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Exact Payments	"gateway": "exactpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fat Zebra	"gateway": "fatzebra" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fenige	"gateway": "fenige" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fibonatix	"gateway": "fibonatixparagon" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Financial Line	"gateway": "finline" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Finanso UA	"gateway": "finansoua" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
FINEXUS	"gateway": "finexus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Finix	"gateway": "finix" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
First American by Deluxe	"gateway": "firstpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
FIS Biller Solutions	"gateway": "fisglobalbsp" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fiserv	"gateway": "fiserv" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fluid Pay	"gateway": "fluidpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
FM Finance LTD	"gateway": "fmfinanceltd" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ForteBank	"gateway": "fortebank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Freedom Finance Bank	"gateway": "axayscom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
FreedomPay	"gateway": "freedompay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
FreedomPay.Money	"gateway": "payboxmoney" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Freepay	"gateway": "freepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Frontstream	"gateway": "frontstreampayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Fung Payments	"gateway": "fungpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GBPayments	"gateway": "gbpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
geidea	"gateway": "geidea" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GETTRX	"gateway": "globalelectronictechnology" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Global One Pay	"gateway": "globalonepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Global Payments	"gateway": "globalpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GMO Payment Gateway	"gateway": "gmopg" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GoDaddy Payments	"gateway": "godaddypayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Good Idea Technologies	"gateway": "git" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GoPay	"gateway": "gopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
GP Webpay	"gateway": "gpwebpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Gravity Payments	"gateway": "gravitypayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Gr4vy	"gateway": "gr4vy" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Halyk Bank	"gateway": "halykbank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Helcim	"gateway": "helcim" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
HIPS	"gateway": "hips" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
HiTrust	"gateway": "hitrustpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Hyp	"gateway": "hyp" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
icard	"gateway": "icardwallet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
iKhokha	"gateway": "ikhokha" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
IMOJE	"gateway": "imoje" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Impaya	"gateway": "impayarus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
InPlat	"gateway": "inplat" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
InstaMed	"gateway": "instamed" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
IntellectMoney	"gateway": "intellectmoney" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Interactive Transaction Solutions	"gateway": "interactivets" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Interswitch Payment Gallery	"gateway": "interswitch" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Intervale	"gateway": "intervale" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ioka fintech	"gateway": "ioka" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
iPay88	"gateway": "ipay88" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
IPSI	"gateway": "ipsi" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
iQmetrix	"gateway": "iqmetrixpaymentservicesgateway" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
IXOPAY	"gateway": "ixopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
JetPay	"gateway": "jetpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
JudoPay	"gateway": "judopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Kassa	"gateway": "kassacom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
kassa24pay	"gateway": "kassa24pay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Kineox	"gateway": "kineox" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Klix by Citadele	"gateway": "klix" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Lapsa Payments	"gateway": "lapsapayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
LHV Pank	"gateway": "lhvpank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Liberty	"gateway": "liberty" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Life Pay	"gateway": "lifepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Limepay	"gateway": "limepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Linkly	"gateway": "linkly" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
LiqPay	"gateway": "liqpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Littlepay	"gateway": "littlepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
LogPay	"gateway": "logpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Loyale	"gateway": "loyale" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
lynck	"gateway": "lynck" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Lyra	"gateway": "lyra" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Magnetiq Bank	"gateway": "magnetiq" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
maib	"gateway": "maibecomm" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MakeCommerce (Maksekeskus)	"gateway": "maksekeskus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Mandarin	"gateway": "mandarin" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Market Pay	"gateway": "marketpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Mastercard Payment Gateway Services	"gateway": "mpgs" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MerchantE	"gateway": "merchante" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Merchant Warrior	"gateway": "merchantwarrior" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Minsait Payments Systems	"gateway": "minsaitpaymentsgateway" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MITEC	"gateway": "mitecmx" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MIXPLAT	"gateway": "mixplat" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MOBI.Money	"gateway": "mobimoney" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Modulbank	"gateway": "modulbank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Molpay	"gateway": "molpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Mondido	"gateway": "mondido" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Monei	"gateway": "monei" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
monek	"gateway": "monek" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Moneris	"gateway": "moneris" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Moneta	"gateway": "moneta" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
Monext	"gateway": "monext" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Money.Mail.Ru	"gateway": "moneymailru" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MPay	"gateway": "managepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
mstartipg	"gateway": "mstartipg" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Multicarta	"gateway": "mulitcarta" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MultiSafepay	"gateway": "multisafepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Mundipagg	"gateway": "mundipagg" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MyCheck	"gateway": "mycheck" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MyChoice2Pay	"gateway": "mychoice2pay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MyFatoorah	"gateway": "myfatoorah" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
MyPay	"gateway": "mypay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
myPOS	"gateway": "mypos" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
N&TS Group	"gateway": "netsgroup" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
NCCC	"gateway": "nccc" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Neon Pay	"gateway": "neonpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Netopia	"gateway": "netopia" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Netvalve	"gateway": "netvalve" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Newebpay (formerly STPath, Pay2Go)	"gateway": "newebpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Newtech	"gateway": "newtechmobile" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Nexi	"gateway": "nexi" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
NMI	"gateway": "gatewayservices" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
noon payments	"gateway": "noonpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Noqoody Pay	"gateway": "noqoodypay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Novalnet	"gateway": "novalnet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Nexi Relay	"gateway": "nexirelay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
NTT DATA	"gateway": "nttdatahk" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Nuvei	"gateway": "nuvei" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Oceanpayment	"gateway": "oceanpayment" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Omise	"gateway": "omise" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
One Inc	"gateway": "oneinc" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Onelya	"gateway": "onelya" "gatewayMerchantId": "`YOUR_GATWAY_MERCHANT_ID`" Developer docs
Onerway	"gateway": "ronghan" "gatewayMerchantId": "`YOUR_GATWAY_MERCHANT_ID`" Developer docs
OneVision Limited	"gateway": "onevision" "gatewayMerchantId": "`YOUR_GATWAY_MERCHANT_ID`" Developer docs
OnPay	"gateway": "onpayio" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Opayo by Elavon	"gateway": "opayoelavon" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
OrkestaPay	"gateway": "orkestapay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Oschadbank	"gateway": "oschadbank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
pagarme	"gateway": "pagarme" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PagBank	"gateway": "pagbank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PagBrasil	"gateway": "pagbrasil" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PagSeguro	"gateway": "pagsegurointernational" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PAY2M	"gateway": "pay2m" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payarc	"gateway": "payarc" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pay.com	"gateway": "paycom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PAYCOMET	"gateway": "paycomet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paydock	"gateway": "paydock" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayEase	"gateway": "payeasenet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayEngine	"gateway": "payengine" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayFabric	"gateway": "payfabric" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayFacto	"gateway": "payfacto" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
paygent	"gateway": "paygent" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payhub	"gateway": "payhub" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayLane	"gateway": "paylane" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payler	"gateway": "payler" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayLink®	"gateway": "paylink" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payload	"gateway": "payload" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymark	"gateway": "paymark" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayMaster	"gateway": "paymaster" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payment Fusion	"gateway": "paymentfusion" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymentvision	"gateway": "paymentvision" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymentwall	"gateway": "paymentwall" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymo	"gateway": "paymo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymob	"gateway": "gpaymob" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paymtech	"gateway": "paymtech" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayNearMe	"gateway": "paynearme" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payneteasy	"gateway": "payneteasy" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pay.nl	"gateway": "paynl" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paynopain	"gateway": "paynopain" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayOne	"gateway": "payone" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayOnline	"gateway": "payonline" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payoo	"gateway": "payoo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayPlus	"gateway": "payplus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payrails	"gateway": "payrails" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payrexx	"gateway": "payrexx" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayRiff	"gateway": "payriff" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payrix	"gateway": "payrix" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paysafe	"gateway": "paysafe" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payscout	"gateway": "payscout" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paysend Business	"gateway": "paysend" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paysoft	"gateway": "paysoft" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pay360	"gateway": "pay360" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
paytech	"gateway": "paytechsolutions" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayTech Ukraine	"gateway": "paytech" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paythru	"gateway": "paythru" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payture	"gateway": "payture" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayU	"gateway": "payu" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayU LATAM	"gateway": "payulatam" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PAYUNi	"gateway": "payuni" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayU Romania	"gateway": "payuro" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PayU Russia	"gateway": "payuru" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Payway	"gateway": "payway" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Paywiser	"gateway": "paywiser" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pelecard	"gateway": "pelecard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pikassa	"gateway": "pikassa" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PingPong	"gateway": "pingpongx" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pin Payments	"gateway": "pinpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Planet	"gateway": "cccpayment" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PlanetPay	"gateway": "itcardpaymentservice" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Plategka.com	"gateway": "plategkacom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Platon	"gateway": "platon" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Pomelo	"gateway": "pomelopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Portmone	"gateway": "portmonecom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Preczn	"gateway": "preczn" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PrimePay	"gateway": "primepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Primer	"gateway": "primer" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Procard	"gateway": "procard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ProcessOut	"gateway": "processout" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Przelewy24	"gateway": "przelewy24" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PSCB	"gateway": "pscbru" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
PXP Financial	"gateway": "pxpfinancial" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Qenta Payment CEE	"gateway": "qenta" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
QIWI	"gateway": "qiwi" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Qualpay	"gateway": "qualpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
QuickPay	"gateway": "quickpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Qvalent	"gateway": "qvalent" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Radial	"gateway": "radial" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Rapyd	"gateway": "rapyd" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
RBK.money	"gateway": "rbkmoney" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Rebail Capital	"gateway": "rebailcapital" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Rebilly	"gateway": "Rebilly" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Recurly	"gateway": "recurly" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Reddot	"gateway": "reddotpayment" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Rede	"gateway": "rede" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Redsys	"gateway": "redsys" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Reepay	"gateway": "reepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
RocketGate	"gateway": "rocketgate" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Russian Standard Bank	"gateway": "rsb" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Ryft	"gateway": "ryft" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Saferpay	"gateway": "worldlinesaferpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Safexpay	"gateway": "safexpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Sberbank	"gateway": "sberbank" "gatewayMerchantId": "`YOUR_ORGANIZATION_NAME`" Developer docs
SEB Baltic	"gateway": "sebbaltic" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
SEBES Technology	"gateway": "sebes" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Sense Bank	"gateway": "sensebank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
SensePass	"gateway": "sensepass" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Shift4	"gateway": "shift4payments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Shiji Group	"gateway": "shijipaymentsolutions" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
SH Start High	"gateway": "shstartpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
simbasoft	"gateway": "simbasoft" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Sipay	"gateway": "sipay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Softbank Payment Service	"gateway": "sbps" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Solid	"gateway": "solid" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Sony Payment Services	"gateway": "sonypaymentservices" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Splitit	"gateway": "splitit" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Spreedly	"gateway": "spreedly" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Square	"gateway": "square" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
SredaPay	"gateway": "sredapay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Stancer	"gateway": "stancer" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Stripe	"gateway": "stripe" "stripe:version": "2018-10-31" "stripe:publishableKey": "`YOUR_PUBLIC_STRIPE_KEY`" Developer docs
Suntech	"gateway": "esafe" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Surfboard Payments	"gateway": "surfboard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Svea Bank	"gateway": "svea" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Swedbank Baltic	"gateway": "swedbankbaltic" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Swedbank Pay	"gateway": "payexswedbankpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TabaPay	"gateway": "tabapay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TapPay (Cherri Tech)	"gateway": "tappay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TapPayments	"gateway": "tappayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
tarlanpayments	"gateway": "tarlanpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TAS Link	"gateway": "taslink" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tatra banka (CardPay)	"gateway": "tatrabanka" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
TEKO	"gateway": "teko" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
theMAP	"gateway": "themap" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Till Payments	"gateway": "tillpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tinkoff	"gateway": "tinkoff" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TPay	"gateway": "tpaycom" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TPay.com	"gateway": "tpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Transact Campus	"gateway": "transactcampus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Transaction Services Network	"gateway": "tns" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Transpayrent	"gateway": "transpayrent" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tranzila	"gateway": "tranzila" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tranzzo	"gateway": "tranzzo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tribe Payments	"gateway": "tribepayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Truevo	"gateway": "truevo" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
TrustPay	"gateway": "trustpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Trust Payments	"gateway": "trustpayments" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Tuna	"gateway": "tuna" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
2can&ibox	"gateway": "twocan" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
UAPAY	"gateway": "uapay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
UBRR	"gateway": "ubrrpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Ukrcardpay	"gateway": "ukrcardpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
UkrGasBank Pay	"gateway": "ukrgasbankpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Unibank OJSC	"gateway": "unibankcheckout" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
unitedfinancialcorporation	"gateway": "unitedfinancialcorporation" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Uniteller	"gateway": "uniteller" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Unitpay	"gateway": "unitpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Unlimint	"gateway": "unlimint" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Unzer	"gateway": "unzer" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Unzer Austria	"gateway": "unzeraustria" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
UPC	"gateway": "upc" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Upgate	"gateway": "upgate" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
USAePay	"gateway": "usaepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
UseePay	"gateway": "useepay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Valitor	"gateway": "valitor" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Vantiv	"gateway": "vantiv" "vantiv:merchantPayPageId": "`YOUR_PAY_PAGE_ID`" "vantiv:merchantOrderId": "`YOUR_ORDER_ID`" "vantiv:merchantTransactionId": "`YOUR_TRANSACTION_ID`" "vantiv:merchantReportGroup": "*web" Developer docs
Verestro	"gateway": "verestro" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Very Good Security	"gateway": "verygoodsecurity" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Vindicia	"gateway": "vindicia" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Viva Wallet	"gateway": "vivawallet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
VTEX	"gateway": "vtex" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Walletdoc	"gateway": "walletdoc" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Walletto	"gateway": "walletto" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WayForPay	"gateway": "wayforpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WEAT	"gateway": "weatpay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WhenThen	"gateway": "whenthen" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Windcave	"gateway": "windcave" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Wirebank	"gateway": "wirebank" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Wirecard	"gateway": "wirecard" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WOOPPAY	"gateway": "wooppay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WooshPay	"gateway": "swooshtransfer" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldline (GlobalCollect)	"gateway": "globalcollect" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldline - Ingenico (WL Online Checkout)	"gateway": "worldlineingenicoogone" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldline Nordics (Worldline Online Checkout)	"gateway": "worldlineonlinecheckout" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldline Sips	"gateway": "wlsips" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldnet	"gateway": "worldnet" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Worldpay	"gateway": "worldpay" "gatewayMerchantId": "`YOUR_WORLDPAY_MERCHANT_ID`" Developer docs
Wpay	"gateway": "wpayaus" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
WSPay	"gateway": "wspay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
XPATE	"gateway": "xpate" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
xpay	"gateway": "xpaycomua" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
YIĞIM Payment System	"gateway": "yigim" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" No developer docs available
ЮKassa (YooKassa)	"gateway": "yoomoney" "gatewayMerchantId": "`YOUR_SHOP_ID`" Developer docs
Z-credit	"gateway": "zcredit" "gatewayMerchantId": "`YOUR_SHOP_ID`" Developer docs
Zalopay	"gateway": "zalopay" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
ZEN.com	"gateway": "zen" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Zest	"gateway": "zestpayment" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs
Zuora	"gateway": "zuora" "gatewayMerchantId": "`YOUR_GATEWAY_MERCHANT_ID`" Developer docs

Tip: example is a valid gateway name in the test environment. If you want to try out the API, you can leave the code sample above as-is. When you use the example gateway, your site doesn't receive card data capable of a transaction, but the user flow looks the same.

The PAYMENT_GATEWAY tokenization type is the most common merchant implementation of the card payment method in the Google Pay API. If your payment provider isn't supported, you might be able to accept Google Pay by a DIRECT integration. For more information, see the Direct tokenization documentation.

Step 3: Define supported payment card networks

Define the card networks accepted by your site. See the following code sample:

const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

The Google Pay API might return cards on file on Google.com (PAN_ONLY) or a device token on an Android-powered device authenticated with a 3-D Secure cryptogram (CRYPTOGRAM_3DS). You can control whether both methods or just one of them can be returned.

Before you set allowedCardAuthMethods, confirm with your payment processor and acquirer on whether device tokens (CRYPTOGRAM_3DS) are supported in your region.

See the following code sample:

const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

For more information, see CardParameters in our Object reference documentation. Also, check with your gateway or processor for the card networks that are supported, and for support for Android device tokens.

Important:

Make sure that you also apply your existing risk checks and controls for payment transactions to Google Pay transactions. Google Pay validation and fraud checks aren't intended to replace your risk management processes.
If you support PAN_ONLY, ensure that you trigger 3D Secure (step-up authentication) for Google Pay PAN PAN_ONLY transactions in the same way that you trigger 3D Secure for normal card transactions.

Step 4: Describe your allowed payment methods

To describe your allowed payment methods, complete the following steps:

Combine your supported authentication methods and supported card networks in order to describe your site's support for the CARD payment method. See the following code sample:

const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

Extend the base card payment method object to describe information you expect to be returned to your application. Include a description of the tokenized payment data. See the following code sample:
```
const cardPaymentMethod = Object.assign(
  {tokenizationSpecification: tokenizationSpecification},
  baseCardPaymentMethod
);
```

For more information about supported parameters, see CardParameters.

Google Pay currently only supports the CARD payment method type.

Step 5: Load the Google Pay API JavaScript library

To load the Google Pay API JavaScript library, complete the following steps:

Include Google's hosted JavaScript on your page. See the following code sample:

<script
  async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="console.log('TODO: add onload function')">
</script>

After the Google Pay API JavaScript library loads, initialize a PaymentsClient object. Initial development uses a TEST environment, which returns dummy payment methods that are suitable to reference the structure of a payment response. In this environment, a selected payment method isn't capable of a transaction. See the following code sample.
Note: We recommend that you only initialize paymentsClient once. Use the same instance when you invoke all of the other APIs, like CreateButton, IsReadyToPay, PrefetchPaymentData, and LoadPaymentData.
```
const paymentsClient =
    new google.payments.api.PaymentsClient({environment: 'TEST'});
```
For more information about the requirements for a PRODUCTION environment that returns chargeable payment methods, see the Integration checklist.

Step 6: Determine readiness to pay with the Google Pay API

To determine readiness to pay with the Google Pay API, complete the following steps:

Add your allowed payment methods to your base request object. See the following code sample:

const isReadyToPayRequest = Object.assign({}, baseRequest);
isReadyToPayRequest.allowedPaymentMethods = [baseCardPaymentMethod];

Call isReadyToPay() to determine if the Google Pay API is supported by the current device and browser for your specified payment methods. See the following code sample:

paymentsClient.isReadyToPay(isReadyToPayRequest)
    .then(function(response) {
      if (response.result) {
        // add a Google Pay payment button
      }
    })
    .catch(function(err) {
      // show error in developer console for debugging
      console.error(err);
    });

Step 7: Add a Google Pay payment button

Add a Google Pay payment button to your page to encourage shoppers to check out with payment methods that are supported by the Google Pay API and your site. For more information about available button types, colors, and display requirements, see the Brand guidelines.

See the following payment button code sample:

const button =
    paymentsClient.createButton({onClick: () => console.log('TODO: click handler'),
    allowedPaymentMethods: []}); // same payment methods as for the loadPaymentData() API call
document.getElementById('container').appendChild(button);

Step 8: Create a PaymentDataRequest object

To create a PaymentDataRequest object, complete the following steps:

Build a JavaScript object that describes your site's support for the Google Pay API. For a full list of supported properties, see PaymentDataRequest. See the following code sample:
```
const paymentDataRequest = Object.assign({}, baseRequest);
```
Add the payment methods supported by your app, such as any configuration of additional data that's expected in the response. See the following code sample:
```
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
```
Define a total price and currency for a shopper to authorize. See the following code sample:
Important: Merchants that process transactions in the European Economic Area (EEA) or any other countries that are subject to Strong Customer Authentication (SCA) must include the countryCode, totalPrice, and merchantName parameters to meet SCA requirements.
```
paymentDataRequest.transactionInfo = {
  totalPriceStatus: 'FINAL',
  totalPrice: '123.45',
  currencyCode: 'USD',
  countryCode: 'US'
};
```
Provide a user-visible merchant name, and use our TEST merchantId value when in TEST. For more details, and for information on when to replace the TEST merchantId value, see MerchantInfo. See the following code sample of a user-visible merchant name:
```
paymentDataRequest.merchantInfo = {
  merchantName: 'Example Merchant'
  merchantId: '12345678901234567890'
};
```
Note: Our TEST merchantId value is numeric. Your specific merchantId value can be numeric or alphanumeric. Review MerchantInfo for more details on how to obtain your specific merchantId.

Step 9: Register an event handler for user gestures

To register an event handler for user gestures, complete the following steps:

Register a click event handler for the purchase button. The event handler calls loadPaymentData() immediately after it interacts with the Google Pay, payment button.
After a Google user grants permission for your site to receive information about the user's selected form of payment and optional contact data, handle the response from the Google Pay API.
Extract the payment token from the paymentData response. If you implement a gateway integration, pass this token to your gateway without any modifications.
Note: In a TEST environment, a payment response includes summary data about the selected payment method that's suitable for display on a confirmation page. The payment response doesn't include a payment method that's capable of a transaction.
```
paymentsClient.loadPaymentData(paymentDataRequest).then(function(paymentData){
  // if using gateway tokenization, pass this token without modification
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
}).catch(function(err){
  // show error in developer console for debugging
  console.error(err);
});
```

Step 10 (optional): Set up Authorize Payments

Authorize Payments is used to start the payment process and acknowledge a payment's authorization status.

To set up Authorize Payments, take the following steps:

Register an onPaymentAuthorized() callback in PaymentOptions.
Call the loadPaymentData() function with the PAYMENT_AUTHORIZATION callback intent.
Implement onPaymentAuthorized().

Register onPaymentAuthorized callbacks

The following code sample shows how to register onPaymentAuthorized callbacks:

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentAuthorized: onPaymentAuthorized
  }
}

Load payment data with callback intents

The following code sample shows how to initialize the payment sheet with Authorize Payments:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantName: 'Example Merchant'
  merchantId: '12345678901234567890',
};

paymentDataRequest.callbackIntents = ["PAYMENT_AUTHORIZATION"];

Handle onPaymentAuthorized callbacks

The onPaymentAuthorized() callback is invoked with a PaymentData object by Google after a payer approves payment through a user gesture, such as if they click Pay.

The callback returns a Promise<PaymentAuthorizationResult> value. The PaymentAuthorizationResult object has a SUCCESS or ERROR transaction state status. Upon success, the payment sheet is closed successfully. If you encounter an error, the payment sheet renders the error details returned after the payment is processed. The user can change the payment sheet’s payment data and authorize the payment again. See the following code sample:

function onPaymentAuthorized(paymentData) {
  return new Promise(function(resolve, reject){
    // handle the response
    processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
      resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
    });
  });
}

Step 11 (optional for shipping-enabled): Set up Dynamic Price Updates

Dynamic Price Updates allows a merchant to dynamically update shipping options and transaction information based on a chosen shipping address. Additionally, you can dynamically update transaction information based on a chosen shipping option.

To set up Dynamic Price Updates, take the following steps:

Register both the onPaymentAuthorized and onPaymentDataChanged callbacks in PaymentOptions.
Call the loadPaymentData() function with callback intents. For details, see the corresponding example.
Implement onPaymentAuthorized and onPaymentDataChanged.

Register PaymentData callback

The following code sample shows that Dynamic Price Updates requires callback functions to be registered in the PaymentsClient paymentOptions object.

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentAuthorized: onPaymentAuthorized,
    onPaymentDataChanged: onPaymentDataChanged
  }
}

Load payment data with callback intents

The following code sample shows how a payment sheet must be initialized with a required shipping address and shipping options configuration:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantId: '12345678901234567890',
  merchantName: 'Example Merchant'
};

paymentDataRequest.callbackIntents = ["SHIPPING_ADDRESS",  "SHIPPING_OPTION", "PAYMENT_AUTHORIZATION"];


paymentDataRequest.shippingAddressRequired = true;
paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();
paymentDataRequest.shippingOptionRequired = true;

Handle onPaymentDataChanged callback

The onPaymentDataChanged callback is invoked with an IntermediatePaymentData object, which includes the shipping address and shipping option selected in the payment sheet.

The callback returns a Promise<PaymentDataRequestUpdate>. The PaymentDataRequestUpdate object has new transaction information, shipping options, and a payment data error. This data updates the payment sheet.

Handle any exception cases, such as an unserviceable shipping address or invalid shipping option, directly in the payment sheet. Set up a PaymentDataError object to highlight the reason for the error with an error message to the user. Be sure to include the related intent in the message. For details on how to set up the object and message, see the following code sample:

function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let shippingAddress = intermediatePaymentData.shippingAddress;
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};

    if (intermediatePaymentData.callbackTrigger == "INITIALIZE" || intermediatePaymentData.callbackTrigger == "SHIPPING_ADDRESS") {
      if(shippingAddress.administrativeArea == "NJ")  {
        paymentDataRequestUpdate.error = getGoogleUnserviceableAddressError();
      }
      else {
        paymentDataRequestUpdate.newShippingOptionParameters = getGoogleDefaultShippingOptions();
        let selectedShippingOptionId = paymentDataRequestUpdate.newShippingOptionParameters.defaultSelectedOptionId;
        paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(selectedShippingOptionId);
      }
    }
    else if (intermediatePaymentData.callbackTrigger == "SHIPPING_OPTION") {
      paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(shippingOptionData.id);
    }

    resolve(paymentDataRequestUpdate);
  });
}

Promo Codes allow a merchant to dynamically update shipping options and transaction information based on a provided promotional code.

To set up Promo Codes, take the following steps:

Register the onPaymentDataChanged callbacks in PaymentOptions.
Call the loadPaymentData() function with callback intents. For details, see the corresponding example.
Implement the onPaymentDataChanged callback function.

Register Offer callback

The following code sample shows that Promo Codes require callback functions to be registered in the PaymentsClient paymentOptions object.

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentDataChanged: onPaymentDataChanged
  }
}

Load payment data with callback intents

The following code sample shows how a payment sheet must be initialized with an OFFER callback intent:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantId: '12345678901234567890',
  merchantName: 'Example Merchant'
};

paymentDataRequest.callbackIntents = ["OFFER"];

Handle onPaymentDataChanged callback

The onPaymentDataChanged callback is invoked with an IntermediatePaymentData object, which includes the shipping address and shipping option selected in the payment sheet.

The callback must return a Promise<PaymentDataRequestUpdate>. The PaymentDataRequestUpdate object has new transaction information, shipping options, offer data, and a payment data error. This data updates the payment sheet.

Handle any exception cases, such as an invalid promo code, directly in the payment sheet. Set up a PaymentDataError object to highlight the reason for the error with an error message to the user. Be sure to include the related intent in the message. For details on how to set up the object and message, see the following code sample, which references an object (validPromoCodes) containing the promo code values:

function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let redemptionCodes = [];
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};
    paymentDataRequestUpdate.newTransactionInfo = getGoogleTransactionInfo();

    // ensure that promo codes set is unique
    if(typeof intermediatePaymentData.offerData != 'undefined') {
      // convert to set then back to array
      redemptionCodes = Array.from(
        new Set(intermediatePaymentData.offerData.redemptionCodes)
      );
    }

    // OPTIONAL: ensure that the newest promo code is the only one applied
    // redemptionCodes = new Array(redemptionCodes[redemptionCodes.length -1]);

    // validate promo codes and add descriptions to payment sheet
    if (intermediatePaymentData.callbackTrigger === 'OFFER') {
      paymentDataRequestUpdate.newOfferInfo = {};
      paymentDataRequestUpdate.newOfferInfo.offers = [];
      for (redemptionCode of redemptionCodes) {
        if (validPromoCodes[redemptionCode]) {
          paymentDataRequestUpdate = validPromoCodes[redemptionCode].function(
            validPromoCodes[redemptionCode],
            paymentDataRequestUpdate
          );
        } else {
          paymentDataRequestUpdate.error = getGoogleOfferInvalidError(redemptionCode);
        }
      }
    }

Put it all together

The example code blocks in this section show a complete end-to-end example of the Google Pay API JavaScript library tutorial, Authorize Payments, Dynamic Price Updates, and Promo Codes.

Tutorial

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };
  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({environment: 'TEST'});
  }
  return paymentsClient;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
    countryCode: 'US',
    currencyCode: 'USD',
    totalPriceStatus: 'FINAL',
    // set to cart total
    totalPrice: '1.00'
  };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}

/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest)
      .then(function(paymentData) {
        // handle the response
        processPayment(paymentData);
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}
/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
  // show returned data in developer console for debugging
    console.log(paymentData);
  // @todo pass payment token to your gateway to process payment
  // @note DO NOT save the payment credentials for future transactions,
  // unless they're used for merchant-initiated transactions with user
  // consent in place.
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Authorize Payments

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ["PAYMENT_AUTHORIZATION"];

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
    	environment: 'TEST',
      paymentDataCallbacks: {
      	onPaymentAuthorized: onPaymentAuthorized
      }
    });
  }
  return paymentsClient;
}

/**
 * Handles authorize payments callback intents.
 *
 * @param {object} paymentData response from Google Pay API after a payer approves payment through user gesture.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentAuthorizationResult}
 * @returns Promise<{object}> Promise of PaymentAuthorizationResult object to acknowledge the payment authorization status.
 */
function onPaymentAuthorized(paymentData) {
	return new Promise(function(resolve, reject){
    // handle the response
    processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
      resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
  	});
  });
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: "Subtotal",
          type: "SUBTOTAL",
          price: "11.00",
        },
      {
          label: "Tax",
          type: "TAX",
          price: "1.00",
        }
    ],
    countryCode: 'US',
    currencyCode: "USD",
    totalPriceStatus: "FINAL",
    totalPrice: "12.00",
    totalPriceLabel: "Total"
  };
}

/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest);
}

/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
	return new Promise(function(resolve, reject) {
  	setTimeout(function() {
  		// @todo pass payment token to your gateway to process payment
  		paymentToken = paymentData.paymentMethodData.tokenizationData.token;

    	resolve({});
    }, 3000);
  });
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Dynamic Price Updates

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ["SHIPPING_ADDRESS",  "SHIPPING_OPTION", "PAYMENT_AUTHORIZATION"];
  paymentDataRequest.shippingAddressRequired = true;
  paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();
  paymentDataRequest.shippingOptionRequired = true;

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
      environment: "TEST",
      merchantInfo: {
        merchantName: "Example Merchant",
        merchantId: "01234567890123456789"
      },
      paymentDataCallbacks: {
      	onPaymentAuthorized: onPaymentAuthorized,
        onPaymentDataChanged: onPaymentDataChanged
      }
    });
  }
  return paymentsClient;
}


function onPaymentAuthorized(paymentData) {
	return new Promise(function(resolve, reject){

  // handle the response
  processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
    	resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
    });

  });
}

/**
 * Handles dynamic buy flow shipping address and shipping options callback intents.
 *
 * @param {object} itermediatePaymentData response from Google Pay API a shipping address or shipping option is selected in the payment sheet.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#IntermediatePaymentData|IntermediatePaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @returns Promise<{object}> Promise of PaymentDataRequestUpdate object to update the payment sheet.
 */
function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

   	let shippingAddress = intermediatePaymentData.shippingAddress;
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};

    if (intermediatePaymentData.callbackTrigger == "INITIALIZE" || intermediatePaymentData.callbackTrigger == "SHIPPING_ADDRESS") {
      if(shippingAddress.administrativeArea == "NJ")  {
        paymentDataRequestUpdate.error = getGoogleUnserviceableAddressError();
      }
      else {
        paymentDataRequestUpdate.newShippingOptionParameters = getGoogleDefaultShippingOptions();
        let selectedShippingOptionId = paymentDataRequestUpdate.newShippingOptionParameters.defaultSelectedOptionId;
        paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(selectedShippingOptionId);
      }
    }
    else if (intermediatePaymentData.callbackTrigger == "SHIPPING_OPTION") {
      paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(shippingOptionData.id);
    }

    resolve(paymentDataRequestUpdate);
  });
}

/**
 * Helper function to create a new TransactionInfo object.

 * @param string shippingOptionId respresenting the selected shipping option in the payment sheet.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function calculateNewTransactionInfo(shippingOptionId) {
        let newTransactionInfo = getGoogleTransactionInfo();

  let shippingCost = getShippingCosts()[shippingOptionId];
  newTransactionInfo.displayItems.push({
    type: "LINE_ITEM",
    label: "Shipping cost",
    price: shippingCost,
    status: "FINAL"
  });

  let totalPrice = 0.00;
  newTransactionInfo.displayItems.forEach(displayItem => totalPrice += parseFloat(displayItem.price));
  newTransactionInfo.totalPrice = totalPrice.toString();

  return newTransactionInfo;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: "Subtotal",
          type: "SUBTOTAL",
          price: "11.00",
        },
      {
          label: "Tax",
          type: "TAX",
          price: "1.00",
        }
    ],
    countryCode: 'US',
    currencyCode: "USD",
    totalPriceStatus: "FINAL",
    totalPrice: "12.00",
    totalPriceLabel: "Total"
  };
}

/**
 * Provide a key value store for shippping options.
 */
function getShippingCosts() {
        return {
    "shipping-001": "0.00",
    "shipping-002": "1.99",
    "shipping-003": "10.00"
  }
}

/**
 * Provide Google Pay API with shipping address parameters when using dynamic buy flow.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingAddressParameters|ShippingAddressParameters}
 * @returns {object} shipping address details, suitable for use as shippingAddressParameters property of PaymentDataRequest
 */
function getGoogleShippingAddressParameters() {
        return  {
        allowedCountryCodes: ['US'],
    phoneNumberRequired: true
  };
}

/**
 * Provide Google Pay API with shipping options and a default selected shipping option.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingOptionParameters|ShippingOptionParameters}
 * @returns {object} shipping option parameters, suitable for use as shippingOptionParameters property of PaymentDataRequest
 */
function getGoogleDefaultShippingOptions() {
        return {
      defaultSelectedOptionId: "shipping-001",
      shippingOptions: [
        {
          "id": "shipping-001",
          "label": "Free: Standard shipping",
          "description": "Free Shipping delivered in 5 business days."
        },
        {
          "id": "shipping-002",
          "label": "$1.99: Standard shipping",
          "description": "Standard shipping delivered in 3 business days."
        },
        {
          "id": "shipping-003",
          "label": "$10: Express shipping",
          "description": "Express shipping delivered in 1 business day."
        },
      ]
  };
}

/**
 * Provide Google Pay API with a payment data error.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataError|PaymentDataError}
 * @returns {object} payment data error, suitable for use as error property of PaymentDataRequestUpdate
 */
function getGoogleUnserviceableAddressError() {
        return {
    reason: "SHIPPING_ADDRESS_UNSERVICEABLE",
    message: "Cannot ship to the selected address",
    intent: "SHIPPING_ADDRESS"
        };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}


/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest);
}

/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
	return new Promise(function(resolve, reject) {
  	setTimeout(function() {
    	// show returned data in developer console for debugging
   	 console.log(paymentData);
  		// @todo pass payment token to your gateway to process payment
  		paymentToken = paymentData.paymentMethodData.tokenizationData.token;

    	resolve({});
    }, 3000);
  });
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Offers

<div id="container"></div>

<script>
/**
 * Please note: The Promo Code callback is extremely flexible. This example
 * implementation is only one of many ways to interface with it.
 *
 * In production, your promo codes and payment logic should be securely
 * processed on your server, not client-side as in this example. Use AJAX to
 * pass this information to the payment sheet.
 */

/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Define valid promo code strings
 *
 * This object paradigm is not necessary to implement Promo Codes, but provides
 * an example of how to implement promo code behavior in a modular way.
 *
 * In production, your promo codes should be securely processed on your server,
 * not client-side as in this example.
 *
 * code: the way the promo code itself is displayed in the payment sheet
 * description: the description provided to the user on the payment sheet
 * function: the function used to calculate the price change
 * value: the value passed into the above function. This value should be
 * negative for a discount.
 */

const validPromoCodes = {
  SOMEPROMOCODE: {
    code: 'SOMEPROMOCODE',
    description: '20% off all products!',
    function: percentageDiscount,
    value: -20 // value should be negative for a discount
  },
  ANOTHERPROMOCODE: {
    code: 'ANOTHERPROMOCODE',
    description: '$5 dollars off!',
    function: staticDiscount,
    value: -5.00 // value should be negative for a discount
  }
}

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ['AMEX', 'DISCOVER', 'JCB', 'MASTERCARD', 'VISA'];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ['PAN_ONLY', 'CRYPTOGRAM_3DS'];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    gateway: 'example',
    gatewayMerchantId: 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ['OFFER'];
  paymentDataRequest.shippingAddressRequired = false;
  paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
      environment: 'TEST',
      merchantInfo: {
        merchantName: 'Example Merchant',
        merchantId: '01234567890123456789'
      },
      paymentDataCallbacks: {
        onPaymentDataChanged: onPaymentDataChanged
      }
    });
  }
  return paymentsClient;
}

/**
 * These functions handle adding valid promo codes to the payment sheet
 * as well as adjusting the display items to match.
 *
 * To add a new promo code, create a new function per this template
 * and define it as valid in the onPaymentDataChanged function.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @param {string} redemptionCode string representing the promo code to apply
 * @param {string} description string representing the description to show
 * @param {int} discountPercentage int representing the percentage to discount.
 * Please note the discount value should be negative. Ex: -20 = 20% discount.
 * @param {object} PaymentDataRequestUpdate object representing
 * the current state of the payment data request.
 * @returns {object} PaymentDataRequestUpdate object to update the
 * payment sheet with new transaction info and offer data.
 */

function percentageDiscount(promoParameters, paymentDataRequestUpdate) {
  // set variables
  let originalTransactionInfo = getGoogleTransactionInfo();
  /* because this promo code calculates a % of original prices,
   * we need to get the original transaction info */
  let newTransactionInfo = paymentDataRequestUpdate.newTransactionInfo;
  let discount = 0;

    // update promo code and description
  paymentDataRequestUpdate.newOfferInfo.offers.push({
    redemptionCode: promoParameters['code'],
    description: promoParameters['description']
  });

  // calculate discount (from original transaction items only)
  originalTransactionInfo.displayItems.forEach(function(displayItem) {
    discount += parseFloat(displayItem.price) * promoParameters['value'] * 0.01;
  });

  // add displayItem with new discount
  newTransactionInfo.displayItems.push({
      label: promoParameters['code'],
      price: discount.toFixed(2),
      type: 'LINE_ITEM'
  });

  return paymentDataRequestUpdate;
}

function staticDiscount(promoParameters, paymentDataRequestUpdate) {
  // set variables
  let newTransactionInfo = paymentDataRequestUpdate.newTransactionInfo;

    // update promo code and description
  paymentDataRequestUpdate.newOfferInfo.offers.push({
    redemptionCode: promoParameters['code'],
    description: promoParameters['description']
  });

  // add displayItem with new discount
  newTransactionInfo.displayItems.push({
      label: promoParameters['code'],
      price: promoParameters['value'].toFixed(2),
      type: 'LINE_ITEM'
  });

  return paymentDataRequestUpdate;
}

/**
 * Handles offer callback intents.
 *
 * @param {object} itermediatePaymentData response from Google Pay API when a promo code is entered in the google pay payment sheet.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#IntermediatePaymentData|IntermediatePaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @returns Promise<{object}> Promise of PaymentDataRequestUpdate object to update the payment sheet with new transaction info and offer data.
 */
function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let redemptionCodes = new Set();
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};
    paymentDataRequestUpdate.newTransactionInfo = getGoogleTransactionInfo();

    // ensure that promo codes set is unique
    if(typeof intermediatePaymentData.offerData != 'undefined') {
      redemptionCodes = new Set(intermediatePaymentData.offerData.redemptionCodes);
    }

    // validate promo codes and add descriptions to payment sheet
    if (intermediatePaymentData.callbackTrigger === 'OFFER') {
      paymentDataRequestUpdate.newOfferInfo = {};
      paymentDataRequestUpdate.newOfferInfo.offers = [];
      for (redemptionCode of redemptionCodes) {
        if (validPromoCodes[redemptionCode]) {
          paymentDataRequestUpdate = validPromoCodes[redemptionCode].function(
            validPromoCodes[redemptionCode],
            paymentDataRequestUpdate
          );
        } else {
          paymentDataRequestUpdate.error = getGoogleOfferInvalidError(redemptionCode);
        }
      }
    }
    /**
     * Update item costs and total.
     *
     * In production, this final calculation should always be calculated
     * server-side to ensure it matches the price that the merchant sends to the
     * processor.
     */
    paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(
      paymentDataRequestUpdate.newTransactionInfo
    )

    resolve(paymentDataRequestUpdate);
  });
}

/**
 * Helper function to update the TransactionInfo object.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @param {object} transactionInfo respresenting the selected shipping option in the payment sheet.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function calculateNewTransactionInfo(newTransactionInfo) {
  // calculate the new totalPrice from display items
  let totalPrice = 0.00;
  newTransactionInfo.displayItems.forEach(
    function(displayItem) {
      totalPrice += parseFloat(displayItem.price);
    }
  );
  // Note: newTransactionInfo.totalPrice must be a string
  newTransactionInfo.totalPrice = totalPrice.toFixed(2);

  return newTransactionInfo;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: 'Subtotal',
          type: 'SUBTOTAL',
          price: '11.00',
          status: 'FINAL'
        },
        {
          label: 'Tax',
          type: 'TAX',
          price: '1.00'
        }
    ],
    currencyCode: 'USD',
    totalPriceStatus: 'FINAL',
    totalPrice: '12.00',
    totalPriceLabel: 'Total'
  };
}

/**
 * Provide Google Pay API with shipping address parameters.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingAddressParameters|ShippingAddressParameters}
 * @returns {object} shipping address details, suitable for use as shippingAddressParameters property of PaymentDataRequest
 */
function getGoogleShippingAddressParameters() {
        return  {
        allowedCountryCodes: ['US', 'UK', 'FR', 'CA', 'MX', 'GA'],
    phoneNumberRequired: false
  };
}

/**
 * Provide Google Pay API with an invalid offer error.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataError|PaymentDataError}
 * @returns {object} payment data error, suitable for use as error property of PaymentDataRequestUpdate
 */
function getGoogleOfferInvalidError(redemptionCode) {
        return {
    reason: 'OFFER_INVALID',
    message: redemptionCode + ' is not a valid promo code.',
    intent: 'OFFER'
        };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}


/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest)
      .then(function(paymentData) {
        // handle the response
        processPayment(paymentData);
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Process payment data returned by the Google Pay API
 * In a production environment, this function should always be implemented
 * server-side.
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
  // show returned data in developer console for debugging
    console.log(paymentData);
  // @todo pass payment token to your gateway to process payment
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Objective: Proceed to our Integration checklist to validate your integration and request production access.

Tutorial

Step 1: Define your Google Pay API version

Step 2: Request a payment token for your payment provider

Step 3: Define supported payment card networks

Step 4: Describe your allowed payment methods

Step 5: Load the Google Pay API JavaScript library

Step 6: Determine readiness to pay with the Google Pay API

Step 7: Add a Google Pay payment button

Step 8: Create a PaymentDataRequest object

Step 9: Register an event handler for user gestures

Step 10 (optional): Set up Authorize Payments

Register onPaymentAuthorized callbacks

Load payment data with callback intents

Handle onPaymentAuthorized callbacks

Step 11 (optional for shipping-enabled): Set up Dynamic Price Updates

Register PaymentData callback

Load payment data with callback intents

Handle onPaymentDataChanged callback

Step 12 (optional for promo codes): Set up Promo Codes

Register Offer callback

Load payment data with callback intents

Handle onPaymentDataChanged callback

Put it all together

Tutorial

Authorize Payments

Dynamic Price Updates

Offers