public IActionResult GetItemsInSingleOrder(int orderId)
        {
            if (_orderRepo.GetOrderById(orderId) == null)
            {
                return(NotFound("We could not find this order. Please enter a valid order ID."));
            }

            var allItemsInSingleOrder = _productOrderRepo.GetProductOrdersByOrderId(orderId);

            return(Ok(allItemsInSingleOrder));
        }