Hi Subin,

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 \
-d grant_type=refresh_token

If your credentials are incorrect and still facing an issues then could you 
generate a new refresh token with the help of this guide 
<https://developers.google.com/adwords/api/docs/guides/first-api-call#get_an_oauth2_refresh_token_and_configure_your_client>
 and 
retry your request? Let me know if the issue persists.

Thanks,
Milind, AdWords API Team.

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    • Re: 400... 'Milind Sankeshware (AdWords API Team)' via AdWords API Forum

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