Google Ads API v21 will sunset on August 5, 2026. After this date, all v21 API requests will fail, necessitating migration to a newer version to maintain API access.
To assist with the transition, several resources are available: Upgrade to the newest version and view the release notes.
Users can check their recent API requests via the Google Cloud Console by navigating to APIs & Services, selecting Google Ads API, and reviewing the Metrics subtab for method usage.
Read the official announcement here: Google Ads API v21 sunset reminder.