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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.
Define InteractionTypeInfo criteria using one of the predefined
InteractionType
enums. CALL is 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.