Architecture &
Competitive Analysis

// MudadShadowValidator.cs - .NET 8 C#
public class MudadValidationMiddleware : IMiddleware
{
    private readonly IMudadApiClient _mudadClient;
    private readonly ShadowLedgerContext _ledger;

    public async Task InvokeAsync(HttpContext context, RequestDelegate next)
    {
        if (context.Request.Path.StartsWithSegments("/api/payroll"))
        {
            var payload = await context.Request.ReadFromJsonAsync<PayrollSubmission>();
            var validation = await _mudadClient.ValidateComplianceAsync(
                new ComplianceRequest
                {
                    EmployerId = payload.EmployerId,
                    Period = payload.Period,
                    TotalWages = payload.TotalWages,
                    WpsFileHash = payload.ComputeHash()
                });

            if (!validation.IsCompliant)
            {
                await _ledger.RecordRejectionAsync(
                    payload.EmployerId, validation.Errors);
                context.Response.StatusCode = 422;
                await context.Response.WriteAsJsonAsync(
                    new { error = "Compliance validation failed",
                          details = validation.Errors });
                return;
            }

            await _ledger.RecordValidationAsync(payload);
        }
        await next(context);
    }
}