Google has a unified OAuth system for their various APIs. This provider should work for most of them (e.g. GSheet, Gmail, Google Calendar, etc.).
You need to enable individual Google API on the Google API Console before using them.
Under certain circumstances, Google expires a user’s refresh token and the token refresh in Nango will fail. You can find a list of reasons from Google here.
While setting up the OAuth credentials, the Authorized JavaScript origins should be your site URL (https://app.nango.dev if you’re testing from the Nango UI).