You can add a line item (SKU) with quantity to an existing order. If that item is already on the order, the requested quantity will be added to the existing quantity.

Any items added will inherit the traits of the order, including the collection traits. For example, if the order contains a collection with delivery dates March thru April, the newly added SKU will inherit those delivery dates.

Workflow

1. To get the order id, you can use the GET orders endpoint.
2. To get the line item id, you can use the GET skus endpoint.
   a. You can filter this request by a JOOR product id.

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Line Item Object References

Click on "Add Object" below to view the reference documentation for creating a line item.