I want to know if, in the future, PlayFab will make Google API calls even when the user is offline or directly from the server on behalf of the user. e.g. Contacts, IAP, etc.
If so, what permissions / scopes are required?
I'm asking all this because I made the Google+ Android plugin previously that was authenticating players only. Now Google is killing Google Plus slowly and softly and there is a brand new Google Sign-In which looks better than the old one. So the new Sign-In API (deprecating v1) is here since October 2015. You can read the first blog post about this dating back to November 2015.
I'm making a new Android plugin, especially that now Unity 5 supports .aar files.