Tax rate update

Author: armando-rodriguez-cko

src/CheckoutSdk/Payments/Request/Order.cs

@@ -19,6 +19,8 @@ public class Order
         public long? TotalAmount { get; set; }
 
         public long? TaxAmount { get; set; }
+        
+        public long? TaxRate { get; set; }
 
         public long? DiscountAmount { get; set; }
 

src/CheckoutSdk/Payments/Request/Product.cs

@@ -17,6 +17,8 @@ public class Product
         public long? TotalAmount { get; set; }
 
         public long? TaxAmount { get; set; }
+        
+        public long? TaxRate { get; set; }
 
         public long? DiscountAmount { get; set; }