feat: add payment sdk and tenant secret foundation

Tiku.Infrastructure/Commerce/ManualPaymentProvider.cs

@@ -0,0 +1,41 @@
+using System.Text.Json;
+using Tiku.Application.Commerce;
+
+namespace Tiku.Infrastructure.Commerce;
+
+internal sealed class ManualPaymentProvider : IPaymentProvider
+{
+    public string Provider => PaymentProviders.Manual;
+
+    public Task<CreatePaymentProviderResult> CreatePaymentAsync(
+        PaymentProviderAccount account,
+        CreatePaymentProviderRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        var payload = JsonSerializer.SerializeToElement(new
+        {
+            request.OrderNo,
+            request.AmountCents,
+            request.Subject,
+            Message = "manual_payment_requires_tenant_admin_confirmation"
+        });
+
+        return Task.FromResult(new CreatePaymentProviderResult(
+            Provider,
+            request.Method,
+            "pending",
+            null,
+            payload,
+            payload));
+    }
+
+    public Task<PaymentNotificationResult> ParsePaymentNotificationAsync(
+        PaymentProviderAccount account,
+        PaymentNotificationRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        throw new PaymentProviderException(
+            "Manual payment does not accept provider notifications.",
+            "manual_payment_notification_not_supported");
+    }
+}