Firebase Docs Reference FirebaseAuth Framework Reference GameCenterAuthProvider class GameCenterAuthProvider : NSObject A concrete implementation of FIRAuthProvider for Game Center Sign In. getCredential(completion:) Creates a FIRAuthCredential for a Game Center sign in. Declaration Swift class func getCredential(completion: @escaping GameCenterCredentialCallback) -init This class is not meant to be initialized. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated December 17, 2018.