string BuildOrder() { var order = new CreateOrderCommand( cardExpiration: DateTime.UtcNow.AddYears(1), cardNumber: "5145-555-5555", cardHolderName: "Jhon Senna", cardSecurityNumber: "232", cardTypeId: 1, city: "Redmon", country: "USA", state: "WA", street: "One way", zipcode: "zipcode", paymentId: 1, buyerId: 3 ); order.AddOrderItem(new OrderItemDTO() { ProductId = 1, Discount = 8M, UnitPrice = 10, Units = 1, ProductName = "Some name" }); return(JsonConvert.SerializeObject(order)); }