Hi,
Thanks for reaching out to Google Ads API Support.
With regards to your concerns about the OAuth credentials, I can confirm that it is required whether you are using the REST API or the client libraries in retrieving or mutating data via the Google Ads API. You may refer to this documentation for the said OAuth credentials (https://developers.google.com/google-ads/api/docs/first-call/overview).
You may also follow the OAuth cloud project via this link (https://developers.google.com/google-ads/api/docs/first-call/oauth-cloud-project) to configure a Google API Console Project for the Google Ads API and the OAuth client library via this link (https://developers.google.com/google-ads/api/docs/first-call/oauth-client-library) to configure a Client Library for OAuth in the Google Ads API.
Let me know if this clarifies your concerns.
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Google Ads API Team |