Google Ads API v18 will sunset  on August 20, 2025. Starting on this date, all v18 API requests will begin to fail.  Migrate to a newer version  prior to August 20, 2025 to ensure your API access is unaffected.
Here are some resources to help you with the migration:
You can view a list of methods and services your project has recently called using the Google Cloud Console :
Open the APIs & Services  in the Google Cloud Console.
 Click Google Ads API  in the table.
 On the METRICS  subtab, you should see your recent requests plotted on each graph. You can see which methods you've sent requests to in the Methods  table. The method name includes a Google Ads API version, a service, and a method name, such as google.ads.googleads.v18.services.GoogleAdsService.Mutate.
 (Optional) Choose the timeframe you want to view for your requests.  
If you have questions while you’re upgrading, reach out to us on the forum  or at googleadsapi-support@google.com .