Please note that the value must exactly match one of the authorized redirect URIs for the OAuth 2.0 client, which you configured in your client's API Console Credentials page. If this value doesn't match an authorized URI, you will get a redirect_uri_mismatch error. Make sure that you have configured the correct URI.
Also, could you confirm if you’ve followed this guide to add a line with: https://developers.google.com/oauthplayground under Authorized redirect URIs while setting up OAuth 2.0 web client app?
![]() |
Google Ads API Team |