Google has announced an important update regarding the reporting of Performance Max campaigns in the Google Ads API. This change affects how developers and advertisers access and interpret placement data for these campaigns.

Key Points:

1. Current Situation:

   • The detail_placement_view resource is currently returning impression data for Performance Max campaigns.
   • This data may not be accurate for campaigns with the advertising_channel_type of PERFORMANCE_MAX.

2. Upcoming Changes:

   • In the next release (v18) of the Google Ads API, Google will introduce a new resource: performance_max_placement_view.
   • This new resource will be specifically designed for querying placement impression data for Performance Max campaigns.

3. Future Deprecation:

   • In a subsequent release, Google will stop returning impression data from the detail_placement_view for Performance Max campaigns.

4. Recommendations for Developers:

   • Do not rely on impression metrics from detail_placement_view for Performance Max campaigns.
   • Prepare to transition to using the performance_max_placement_view resource for Performance Max campaign data once it's available.

5. Rationale:

   • The detail_placement_view is intended for campaigns with ad groups, while Performance Max campaigns use asset groups.

Google advises API users to be aware of these changes and to plan for the transition to the new performance_max_placement_view resource for more accurate reporting of Performance Max campaigns.