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<PackageReference Include="CommunityToolkit.Maui" Version="8.0.0" />

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dotnet new maui -n NfcMauiApp
cd NfcMauiApp

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// In your LoginViewModel
private async Task OnLoginClicked()
{
    // ... auth logic
    await _navigationService.NavigateToAsync("//Dashboard");
}

// A simple navigation service in Core/Infrastructure/
public class NavigationService : INavigationService
{

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builder.Services.AddTransient<LoginPage>(); // Register the page
builder.Services.AddTransient<LoginViewModel>(); // Register the ViewModel

// Register the concrete service that implements the feature's interface
builder.Services.AddSingleton<IAuthService, AuthService>();

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// Features/Authentication/LoginViewModel.cs
public partial class LoginViewModel : ObservableObject
{
    private readonly IAuthService _authService;
    private readonly INavigationService _navigationService;

    [ObservableProperty]
    private string _userName;

    [ObservableProperty]

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// Features/Authentication/IAuthService.cs
public interface IAuthService
{
    Task<bool> LoginAsync(string username, string password);
    Task<bool> LogoutAsync();
}

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MyMauiApp/
├── Features/
│   ├── Authentication/
│   │   ├── LoginPage.xaml
│   │   ├── LoginPage.xaml.cs
│   │   ├── LoginViewModel.cs
│   │   ├── LoginCommand.cs
│   │   └── IAuthService.cs // Feature-specific interface
│   ├── Dashboard/
│   │   ├── DashboardPage.xaml

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MyMauiApp/
├── Views/
├── ViewModels/
├── Models/
├── Services/
└── Repositories/

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    var isAuthenticated = await BiometricAuthenticationService.AuthenticateAsync();
    if (isAuthenticated)
    {
        // Proceed to load the private key and sign
    } 

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    [HttpPost("verifyLogin")]
    public async Task<IActionResult> VerifyLogin([FromBody] LoginVerificationRequest request)
    {
        // 1. Find the user and their stored public key
        var user = await _context.Users.FirstOrDefaultAsync(u => u.Username == request.Username);
        if (user == null) return Unauthorized();
        
        // 2. Recreate the original challenge that was sent to this user
        // (You would need to store this challenge temporarily with an expiry)
        byte[] challengeBytes = GetStoredChallengeForUser(user.Username);