The "invalid_grant" error usually indicates that the access or refresh
token being passed in your request is incorrect or invalid.
To verify that your credentials are correct, you could also try the CURL
request provided below and see if you are able to generate the access
tokens? If the credentials are correct, you should get an access token for
the below request.
curl https://www.googleapis.com/oauth2/v4/token \
-d refresh_token=your-refresh_token \
-d client_id=your-client-id \
-d client_secret=your-client-secret \
If your credentials are incorrect and still facing an issues then could you
generate a new refresh token with the help of this guide
retry your request? Let me know if the issue persists.
Milind, AdWords API Team.
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