Override bidding strategies
A bid strategy can only be set at the campaign level. So for example, if a
campaign has already been assigned a TARGET_ROAS
strategy, setting
TARGET_CPA fields in one of its ad groups will have no effect.
Override Target ROAS at the ad group level
The target_roas
field of a TargetRoas
bidding scheme (or a
MaximizeConversionValue with its
target_roas field set)
can be overridden at the ad group level by setting the ad group's
target_roas
field. The other fields of the bidding scheme cannot be
overridden.
To remove an override, unset target_roas
of the ad group by sending a mutate request with an empty field value
but still supplying the path in a
field mask (e.g., PHP).
Attempting to override the target_roas field of
a TargetRoas scheme associated to a portfolio
strategy will result in an error.
You can retrieve the effective target_roas value of an ad group with the
effective_target_roas
field and its source with the effective_target_roas_source
field.
Override Target CPA at the ad group level
The target_cpa_micros
field of a TargetCpa
bidding scheme (or a
MaximizeConversions with its
target_cpa field set)
can be overridden at the ad group level by setting the ad group's
target_cpa_micros
field. The other fields of the bidding scheme cannot be
overridden.
To remove an override, unset target_cpa_micros
of the ad group by sending a mutate request with an empty field value
but still supplying the path in a
field mask (e.g., PHP).
You can retrieve the effective value of target_cpa_micros for an ad group from the
effective_target_cpa_micros
field and its source from the effective_target_cpa_source
field.