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This guide will walk you through how to setup OAuth2 for API access using your
own credentials usingservice accounts.
These steps only need to be done once, unless you revoke or delete your OAuth2
credentials.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-03 UTC."],[[["\u003cp\u003eThis guide explains how to set up OAuth2 for API access using service accounts, a one-time process unless credentials are changed.\u003c/p\u003e\n"],["\u003cp\u003eThe setup requires a Google Workspace domain and a service account with domain-wide delegation access granted by a super administrator.\u003c/p\u003e\n"],["\u003cp\u003eYou need to generate a service account ID and JSON file before configuring the client library.\u003c/p\u003e\n"],["\u003cp\u003eThe client library setup involves specifying the path to your JSON keyfile and the email address to impersonate within your \u003ccode\u003egoogle_ads_config.rb\u003c/code\u003e file.\u003c/p\u003e\n"]]],[],null,["# OAuth Service Account Flow\n\nThis guide will walk you through how to setup OAuth2 for API access using your\nown credentials using [service accounts](/google-ads/api/docs/oauth/service-accounts).\nThese steps only need to be done once, unless you revoke or delete your OAuth2\ncredentials.\n\nCreate OAuth2 credentials\n-------------------------\n\n| **Note:** This flow requires a [Google Workspace](//workspace.google.com) domain and the service account that you created needs to be granted domain wide delegation access by a super administrator for the domain.\n\n[Generate a **service account ID and a \\*.JSON file**](/google-ads/api/docs/oauth/service-accounts#service_account_access_setup)\nby following the linked instructions, then come back to this page.\n\nSet up client library with JSON file\n------------------------------------\n\nConfigure the following keys in your [`google_ads_config.rb`](https://github.com/googleads/google-ads-ruby/blob/HEAD/google_ads_config.rb#L29). \n\n c.keyfile = 'path/to/keyfile.json'\n c.impersonate = 'INSERT_EMAIL_ADDRESS_TO_IMPERSONATE_HERE'"]]
