Get method for API

 public Order GetById(int orderId)
        {
            var customerData = _orders.FirstOrDefault(x => x.Id == orderId);
            StandardDelivery delivery = new StandardDelivery(orderData: customerData);
            delivery.State = StandardDeliveryState.Prepare;
            delivery.State = StandardDeliveryState.Dispatch;
            delivery.State = StandardDeliveryState.Delivery;
            customerData.DeliveryDate = delivery.deliveryDate;
            delivery.Dispose();

            return customerData;
        }