Future<void> _signInWithPlayGames() async {
  // Get server auth code from 3rd party provider
  // See PR description for details on how you might get the server auth code:
  // https://github.com/firebase/flutterfire/pull/12201#issue-2100392487
  final serverAuthCode = '...';
  final playGamesCredential = PlayGamesAuthProvider.credential(
                                          serverAuthCode: serverAuthCode);

  await FirebaseAuth.instance
    .signInWithCredential(playGamesCredential);
}

import 'package:firebase_auth/firebase_auth.dart';

Future<UserCredential> signInWithApple() async {
  final appleProvider = AppleAuthProvider();
  if (kIsWeb) {
    await FirebaseAuth.instance.signInWithPopup(appleProvider);
  } else {
    await FirebaseAuth.instance.signInWithProvider(appleProvider);
  }
}

// Implement a function that generates a nonce. See iOS documentation for how to create a nonce:
// https://firebase.google.com/docs/auth/ios/apple#sign_in_with_apple_and_authenticate_with_firebase
String rawNonce = createNonce();
// Create a SHA-256 hash of the nonce. Consider using the `crypto` package from the pub.dev registry.
String hashSHA256String = createHashSHA256String(rawNonce);
// Use the hash of the nonce to get the idToken. Consider using the `sign_in_with_apple` plugin from the pub.dev registry.
String idToken = await getIdToken();

final fullName = AppleFullPersonName(
  familyName: 'Name',
  givenName: 'Your',
);
// Use the `rawNonce` and `idToken` to get the credential
final credential = AppleAuthProvider.credentialWithIDToken(
  idToken,
  rawNonce,
  fullName,
);

await FirebaseAuth.instance.signInWithCredential(credential);

import 'package:firebase_auth/firebase_auth.dart';

Future<UserCredential> signInWithApple() async {
  final appleProvider = AppleAuthProvider();

  UserCredential userCredential = await FirebaseAuth.instance.signInWithPopup(appleProvider);
  // Keep the authorization code returned from Apple platforms
  String? authCode = userCredential.additionalUserInfo?.authorizationCode;
  // Revoke Apple auth token
  await FirebaseAuth.instance.revokeTokenWithAuthorizationCode(authCode!);
}

Future<void> _signInWithGameCenter() async {
  final credential = GameCenterAuthProvider.credential();
  await FirebaseAuth.instance
      .signInWithCredential(credential);
}

import 'package:firebase_auth/firebase_auth.dart';

Future<UserCredential> signInWithMicrosoft() async {
  final microsoftProvider = MicrosoftAuthProvider();
  if (kIsWeb) {
    await FirebaseAuth.instance.signInWithPopup(microsoftProvider);
  } else {
    await FirebaseAuth.instance.signInWithProvider(microsoftProvider);
  }
}

import 'package:firebase_auth/firebase_auth.dart';

Future<void> _signInWithTwitter() async {
  TwitterAuthProvider twitterProvider = TwitterAuthProvider();

  if (kIsWeb) {
    await FirebaseAuth.instance.signInWithPopup(twitterProvider);
  } else {
    await FirebaseAuth.instance.signInWithProvider(twitterProvider);
  }
}

import 'package:firebase_auth/firebase_auth.dart';

Future<UserCredential> signInWithYahoo() async {
  final yahooProvider = YahooAuthProvider();
  if (kIsWeb) {
    await _auth.signInWithPopup(yahooProvider);
  } else {
    await _auth.signInWithProvider(yahooProvider);
  }
}

final appleProvider = AppleAuthProvider();

final user = await FirebaseAuth.instance.signInWithProvider(appleProvider);
final accessToken = user.credential?.accessToken;

// You can send requests with the `accessToken`

await FirebaseAuth.instance.signInAnonymously();

final appleProvider = AppleAuthProvider();

if (kIsWeb) {
  await FirebaseAuth.instance.currentUser?.linkWithPopup(appleProvider);

  // You can also use `linkWithRedirect`
} else {
  await FirebaseAuth.instance.currentUser?.linkWithProvider(appleProvider);
}

// You're anonymous user is now upgraded to be able to connect with Sign In With Apple

final appleProvider = AppleAuthProvider();

if (kIsWeb) {
  await FirebaseAuth.instance.currentUser?.reauthenticateWithPopup(appleProvider);

  // Or you can reauthenticate with a redirection
  // await FirebaseAuth.instance.currentUser?.reauthenticateWithRedirect(appleProvider);
} else {
  await FirebaseAuth.instance.currentUser?.reauthenticateWithProvider(appleProvider);
}

// You can now perform sensitive operations