Adding Line items in existing order does not seem to work

[RubinhoD]

Hi,

I try to add a free product in the order created webhook. It does not return an error, but also no extra product is added in the order

Is this possible or am i doing it wrong?

var order = getOrder(orderId);
var orderlines = order.LineItems.ToList(); orderlines.Add(new LineItem { Price = 0, ProductId = productId, Quantity = 1 }); order.LineItems = orderlines; var service = new OrderService(CurrentShop.Name, CurrentShop.Token); await service.UpdateAsync(order.Id.Value, order);

[nozzlegear]

Hey @RubinhoD, did you get this working? I'm not positive but I think once an order is already created, you can't modify its line items or price. If you need to do that then you might want to use a Draft Order via the DraftOrderService class.

[RubinhoD]

Hi @nozzlegear , yes i got it working, but not this way. Shopify does not support order updates via this Api, but you should use GraphQL.

Below, you find my example. I also used the GraphQLNETClient.cs class from here to execute: https://github.com/kiflay/GraphQL-NET-Client

` var graphQl = new GraphQLNETClient { CurrentShop = CurrentShop };

        // Start mutation
        string query = @"
            mutation {
                    orderEditBegin(id: ""gid://shopify/Order/" + orderId + @""") {
		                calculatedOrder {
			                id
		                }
	                }
                }
        ";
        var jSonResponse = await graphQl.Execute(query);
        var calculatedOrder = jSonResponse.data.orderEditBegin.calculatedOrder.id.ToString();

        // Add orderline
        query = @"
            mutation addVariantToOrder{
              orderEditAddVariant(id: """ + calculatedOrder + @""", variantId: ""gid://shopify/ProductVariant/" + productId + @""", quantity: " + quantity + @"){
                        calculatedLineItem  {
                            id
                        }
                        userErrors {
                            field
                            message
                        }
                    }
                }
        ";

        jSonResponse = await graphQl.Execute(query);
        var lineItemId = jSonResponse.data.orderEditAddVariant.calculatedLineItem.id.ToString();
        

        // Discount
        query = @"
            mutation orderEditAddLineItemDiscount{
                orderEditAddLineItemDiscount(discount: {percentValue: 100}, id: """ + calculatedOrder + @""", lineItemId: """ + lineItemId + @"""){

                        userErrors {
                            field
                            message
                        }
                    }
                }
        ";



        // Commit
        jSonResponse = await graphQl.Execute(query); // Response eventueel loggen
        query = @"
            mutation commitEdit {
              orderEditCommit(id: """ + calculatedOrder + @""", notifyCustomer: false) {
                        order {
                            id
                        }
                        userErrors {
                            field
                            message
                        }
                    }
                }
        ";

        jSonResponse = await graphQl.Execute(query); `