I’m working through a problem right now and want to see if anyone here has any ideas. We are trying to create shipments for established Magento orders over REST API but we are getting errors due to the fact that Magento expects to receive the configurable product order_item_id in the payload. Our integration sends only the simple product order_item_id in the payload. It seems that for orders with configurable products, the json payload needs to have the configuratable product oder_item_id to process correctly. This seems crazy to me since configurable products are not real and cannot be included in any shipment as an item. Has anyone had a similar issue?