Hi Rahul, The 'invalid_grant' error is usually noticed when the access token or refresh token is invalid or incorrect. 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?
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 Let me know if the issue persists. Thanks, Milind, AdWords API Team. -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and Google+: https://googleadsdeveloper.blogspot.com/ https://plus.google.com/+GoogleAdsDevelopers/posts =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/adwords-api. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/92d2dde1-bd5e-4d64-bde8-eedfd16534de%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
