I have a clover device setup to automatically print orders with certain labels, I am creating a order through the web api and I want to attach the labels to the orders so that they automatically print. what field do I attach these label items to? Do I attach them to the line item or orders as I don't see a property for labels on either objects.
Items have labels. That is copied into the line item when added to an order. I'd suggest experimenting with Clover apps (inventory, printers) to set up labels it might give you a better understanding how the system works.