public IActionResult UpdateProductOrderQuantityInCart(int productId, int orderId, int qty)
        {
            var lineItem = _productOrderRepo.Update(productId, orderId, qty);

            if (_productOrderRepo.GetLineItemByProductAndOrder(productId, orderId) == null)
            {
                return(NotFound("We could not find a line item with this productID and this orderID. Please try again."));
            }

            return(Ok(lineItem));
        }