Hi,
Thank you for reaching out to Google Ads API Forum.
I understand that you need to get the costs of your performance max campaigns per asset group. Kindly note that getting the cost metrics for asset groups is not currently available via the API. However, our team has already submitted a feature request for this and it will be subject for review. All I can say is for now, please keep an eye on our blog and release notes for new releases and updates.
Reference Links:
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Google Ads API Team |