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Is Google sign free?

Google Sign-in is a free service. To use Google sign-in you have to use Google’s Firebase authentication service.

Is Google sign-in an API?

Google sign-in is accomplished by obtaining a Google OAuth 2.0 credential using the Google sign-in for Android APIs on the device and passing it to this API. … The current (recommended) method for obtaining a Google account credential in an Android application is to call GoogleSignInAccount.