dobrý návod:

https://www.drupal.org/node/2551873

stručně HELP:

CONFIGURATION TO USE OAUTH 2.0
------------------------------
Google Account Api Access Configuration:
1. Visit https://code.google.com/apis/console
2. Create a new project.
3. Enable "Analytics API" (Some other APIs are automatically enabled, you can
disable them if you want).
4. Under "APIs & auth >> Credentials" create an Oauth 2.0 Client ID with
application type "Web application", configure consent screen as you wish.
5. Configure Client ID settings:
-Redirect URIs: http://example.com/admin/config/system/google_analytics_counter/authenti...
-JavaScript origins: http://example.com
6. Copy the client id and client secret to the configuration form of the module
in admin/config/system/google_analytics_counter/authentication.