Hi Ritesh, In the AdWords API perspective, you can only authenticate in the AdWords API as service account if you have a G Suite domain <https://gsuite.google.com/>. If you don't have a G Suite domain, then you need to authenticate as other types such as Installed application or Web application types. If you have a G Suite domain and you wish to authenticate as service account for the purpose of impersonation, then you need to follow this guide <https://developers.google.com/adwords/api/docs/guides/authentication#oauth2_service_accounts> .
Service account authentication is quite complex in the AdWords API compared to other Google APIs so it is important that you follow the step-by-step guide from "Setting up service account access" section <https://developers.google.com/adwords/api/docs/guides/authentication#setting_up_service_account_access> to "Configuring your client library" section <https://developers.google.com/adwords/api/docs/guides/authentication#configuring_your_client_library>. You also don't need to add the service account email address (e.g. xyx...@iam.gserviceaccount.com) in your AdWords account as the main purpose of this authentication type is to impersonate as any user in your AdWords account. You may review and then follow the guide and let me know if any issue persists. If you encounter any issues/errors, then tell me what step you are currently having issues and provide any error messages or information regarding the issue via *Reply privately to author* option. Thanks, Vincent 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 email@example.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/017ed219-f1e6-4d46-a637-7c5642e64d66%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.