Add payment import

Hcs.TestApp/TestApp/Scenario/PaymentsScenario.cs

@@ -0,0 +1,27 @@
+using Hcs.Client;
+using Hcs.Client.Api.Payload.Payments;
+using System;
+
+namespace Hcs.TestApp.Scenario
+{
+    internal class PaymentsScenario(UniClient client)
+    {
+        private readonly UniClient client = client;
+
+        internal void ImportSupplierNotificationsOfOrderExecution()
+        {
+            var payload = new ImportSupplierNotificationsOfOrderExecutionPayload()
+            {
+                orderDate = new DateTime(2025, 9, 5),
+                month = 8,
+                year = 2025,
+                paymentDocumentId = "00АА095186-02-5081",
+                amount = 4000M,
+                onlinePayment = true
+            };
+
+            var result = client.Payments.ImportSupplierNotificationsOfOrderExecutionAsync(payload).Result;
+            Console.WriteLine("Scenario execution " + (result ? "succeeded" : "failed"));
+        }
+    }
+}