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. You can filter by product id.
3. Use this id in this endpoint to update your quantities.

Note: You can only update an order's Order Line Items if the Order is in the In Progres, Notes, or Pending status. If you want to update an Order in other statuses, you must change its status to one of the above statuses first.

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Line Item Object References

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