VCST-1698: prepare shipment middleware

src/VirtoCommerce.XCart.Core/CartAggregate.cs

@@ -562,6 +562,15 @@ public virtual async Task<CartAggregate> AddShipmentAsync(Shipment shipment, IEn
                 shipment.Price = shippingMethod.Rate;
                 shipment.DiscountAmount = shippingMethod.DiscountAmount;
             }
+
+            // pass shipment to the middleware pipeline
+            var shipmentContext = new ShipmentContextCartMap
+            {
+                CartAggregate = this,
+                Shipment = shipment,
+            };
+            await _pipeline.Execute(shipmentContext);
+
             return this;
         }
 

src/VirtoCommerce.XCart.Core/Models/ShipmentContextCartMap.cs

@@ -0,0 +1,11 @@
+using VirtoCommerce.CartModule.Core.Model;
+
+namespace VirtoCommerce.XCart.Core.Models
+{
+    public class ShipmentContextCartMap
+    {
+        public CartAggregate CartAggregate { get; set; }
+
+        public Shipment Shipment { get; set; }
+    }
+}

src/VirtoCommerce.XCart.Data/Extensions/ServiceCollectionExtensions.cs

@@ -58,6 +58,8 @@ public static IServiceCollection AddXCart(this IServiceCollection services, IGra
                 builder.AddMiddleware(typeof(MapPromoEvalContextMiddleware));
             });
 
+            services.AddPipeline<ShipmentContextCartMap>();
+
             return services;
         }
     }