Hello,
Thanks for reaching out. If you are looking for a mapping from the creativeId field in the AdWords API to the new Ads API, you can find this mapping
here. The creativeId field was supported in multiple reports, but, for example, the creativeId field in the Ads API click_view maps to click_view.ad_group_ad.
Hope this helps.
Regards,
Matt
Google Ads API Team

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