var result = await FirebaseApp.CheckAndFixDependenciesAsync();
if (result != DependencyStatus.Available) return;

var config = new FirebaseConfig();
// add support google signin
config.AddCredentialProvider(new GoogleProvider("webClientId"));
// add support apple signin
config.AddCredentialProvider(new AppleProvider());

var auth = FirebaseAuth.DefaultInstance;
IGate gate = new FirebaseGate(auth, config);

var user = UserInfo.Invalid;
try
{
    user = await GateManager.InitializeAsync(gate);
}
catch (InvalidCredentialException e)
{
    Debug.LogError(e.Reason.ToString());
}

if(user.IsValid())
{
    // success previous credentional signin
    return;
}

try
{
  // google signin
  user = await GateManager.SignInAsync(GoogleProvider.Id);
  
  // apple signin
  // user = await GateManager.SignInAsync(AppleProvider.Id);
}
catch(SignInFailedException e)
{
    Debug.LogError(e.Message);
}

if(user.IsValid())
{
    // success signin
}

var config = new FirebaseConfig();
config.AddCredentialProvider(new GoogleProvider("webClientId"));

var auth = FirebaseAuth.DefaultInstance;
IGate gate = new FirebaseGate(auth, config);

var user = await GateManager.InitializeAsync(gate);

var user = await GateManager.SignInAsync(GoogleProvider.Id);