is done

ElectronicsShop/ElectronicsShopRestAPI/Controllers/ClientController.cs

@@ -57,7 +57,7 @@ namespace ElectronicsShopRestAPI.Controllers {
 			}
 		}
 
-		[HttpGet]
+		[HttpPost]
 		public void CreatePaymeant (PaymeantBindingModel model) {
 			try {
 				_payLogic.CreatePay(model);

ElectronicsShop/ElectronicsShopShopClientApp/Controllers/HomeController.cs

@@ -287,6 +287,10 @@ namespace ElectronicsShopUserApp.Controllers {
                 return PaymeantOption.Íåîïëà÷åíî;
             }
         }
-       
+        [HttpPost]
+		public double Calc(int count, int product) {
+			var _product = APIClient.GetRequset<ProductViewModel>($"api/main/getproduct?_productid={product}");
+			return count * (_product?.Price ?? 1);
+		}
 	}
 }