Authenticate without GAS

To authenticate an application that is not behind GAS, for example applications that include mobile, desktop, and Text User Interface (TUI) , you need to implement OAuth in a specific way.

In your application code, these functions need to be called in the following order:
  1. OAuthAPI.FetchOpenIDMetadata() to retrieve the metadata from the Identity Provider from the required URL.
  2. OAuthAPI.RetrievePasswordToken() to return the access token.
  3. OAuthAPI.initService() to register the access token.
See the code sample in OAuth access without GAS.