Google My Business Offline Access Demo
This demo demonstrates the use of using Google Identity Services and OAuth to gain authorization to call the Google My Business API on behalf of the user, even when the user is offline. When a refresh token is acquired, store this token securely on your database. You will then be able to use this token to refresh the OAuth credentials and make offline API calls on behalf of the user. The user may revoke access at any time from the Account Settings page.