<script src="https://www.google.com/adsense/js/embedded-connect.js?load=initEmbeddedConnect&hl={language}" async defer></script>

<script src="https://www.google.com/adsense/js/embedded-connect.js?load=initEmbeddedConnect&hl={language}&headless=true" async defer></script>

<div id="adsenseEmbeddedConnect"></div>

function initEmbeddedConnect() {
    adsenseEmbeddedConnect.init({
        // <div> to show the Embedded Connect widget in
        'divId': 'adsenseEmbeddedConnect',

        // OAuth client ID from step 2
        'clientId': 'xxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com',

        // Access token from the Google Identity APIs, see
        // https://developers.google.com/identity/oauth2/web/guides/use-token-model
        // Use the following scope when requesting the access token:
        // https://www.googleapis.com/auth/adsense.readonly
        'accessToken': 'xxxxxxxxxxxxxxxxxxxxxxx',

        // Login hint, an optional parameter which suppresses the account
        // chooser and either pre-fills the email box on the sign-in form,
        // or selects the proper session (if the user is using multiple
        // sign-in)
        'loginHint': 'user@example.com',

        // Child site (which is added to AdSense as part of the Embedded Connect flow)
        // Consult with your account manager to ensure this value is set correctly for your platform
        'siteUrl': 'site.example.com',

        // Optional parameter, the publisher ID of the user.
        // When set, the Embedded Connect widget will display the state of the user's AdSense account.
        // When unset, the Embedded Connect widget will show the default state which triggers the connection flow.
        'publisherId': "pub-0000000000000000",

        'onConnect': function(pid) {
          // Your custom code to send the publisher ID (pid) to your server for it to be saved.
          // The onConnect function is called when the user has completed all the onboarding steps
        },
        'onDisconnect': function() {
          // Your custom code to forget the publisher ID.
          // This onDisconnect function is called when the user has clicked the "Disconnect" button in the Embedded Connect widget
        },
    });
};

<script src="https://www.google.com/adsense/js/embedded-connect.js?load=initEmbeddedConnect&hl={language}&headless=true" async defer></script>

<button onclick="connectAdSense()">Connect to AdSense</button>
<button onclick="disconnectAdSense()">Disconnect account</button>

function connectAdSense(){
    adsenseEmbeddedConnect.connect({
        // OAuth client ID
        'clientId': 'xxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com',

        // Access token from the Google Identity APIs, see
        // https://developers.google.com/identity/oauth2/web/guides/use-token-model
        // Use the following scope when requesting the access token:
        // https://www.googleapis.com/auth/adsense.readonly
        'accessToken': 'xxxxxxxxxxxxxxxxxxxxxxx',

        // Child site (which is added to AdSense as part of the Embedded Connect flow)
        // Consult with your account manager to ensure this value is set correctly for your platform
        'siteUrl': 'site.example.com',

        'onConnect': function(response) {
            // Your custom code to send the publisher ID (response[publisherId]) to your server for it to be saved.
            // The onConnect function is called when the user has completed all the onboarding steps
            // Note that you'll additionally receive an OAuth2 access token (response[token]) which can be used with the AdSense Management API to perform other operations
        },
        'onCancel': function() {
            // This callback is called if the user closes the popup window without completing the sign-up flow
        }
    });
}

function disconnectAdSense(){
    // Your custom code to forget the publisherId from your server.
}