Firebase Docs Reference FirebaseAuthProvider public interface FirebaseAuthProvider Represents the Firebase Authentication provider type. Constant Summary String PROVIDER_ID Unique string identifier for this provider type. Constants public static final String PROVIDER_ID Unique string identifier for this provider type. Constant Value: "firebase" 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 May 23, 2018.