Bid modifiers let you adjust bids for a specific criterion without changing the targeting of your campaign or ad group. For example, an ad group bid modifier for mobile devices doesn't exclude impressions for other types of devices, but it does let you raise or lower your bids for mobile impressions.
For more information on how bidding works and how to set bid modifiers, see our Bidding guide.
Campaign bid modifiers
You can specify bid modifiers at the campaign level for the following criteria
type using the CampaignBidModifierService.
InteractionTypeInfo- Define
InteractionTypeInfocriteria using one of the predefinedInteractionTypeenums.CALLis the only supported enum value for campaign bid modifiers.
Ad group bid modifiers
You can specify bid modifiers at the ad group level for the following criteria
types using the AdGroupBidModifierService.
DeviceInfo- Define the
DeviceInfocriteria using one of the predefined Device enums. - Various Hotel Ads criteria
- Check out the Hotel Ads bid modifier guide for more details.