GA and GAW refresh and access tokens

1. https://developers.google.com/adwords/api/docs/guides/authentication

GA and GAW use both refresh and access tokens however there are differences in how we use them in our apps.

• GA

  we don’t use any official google gem and provide both tokens manually when making API call to GA (access token is stored in Rails cache and manually updated when expired).

• GAW

  we use google-adwords-api gem to make API calls to GAW and only refresh token must be provided to configure API client - access token is updated by gem itself.