BiddingSource

Indicates where a bid or target is defined. For example, an ad group criterion may define a cpc bid directly, or it can inherit its cpc bid from the ad group.

Enums
UNSPECIFIED Not specified.
UNKNOWN Used for return value only. Represents value unknown in this version.
CAMPAIGN_BIDDING_STRATEGY Effective bid or target is inherited from campaign bidding strategy.
AD_GROUP The bid or target is defined on the ad group.
AD_GROUP_CRITERION The bid or target is defined on the ad group criterion.