Boxc Overpacks API

The Overpacks resource allows a user to combine many Shipments into one object for faster clearance with BoxC and Customs. An overpack can be a carton, container, pallet, or bag. Regardless, it must contain an overpack label on the outside. Empty overpacks are routinely purged from the system.When creating an overpack it's recommended to provide one or more shipment ID, label ID, or tracking numbers in the request. The overpack will inherit the first shipment's (`n`) attributes like the `entry_point`, `service`, `terms`, etc. All shipments require identical attributes to be a part of the same overpack. Errors will be returned if the `n + 1` shipments do not match the first one. An error message will be present in the `shipments` array for each shipment that fails while creating or updating overpacks. Shipments that pass validation will still be added in the same request.The system will calculate the routing and other applicable carrier logic to determine the physical appearance of the label. Some carriers require custom messaging on the labels while others require a completely different label altogether. The system handles this logic on your behalf.**Note:** Shipments without labels and cancelled shipments can't be added to overpacks.The overpack(s) must be dropped off at the BoxC collection center indicated by the `entry_point`. Some entry points do not require overpacking and the system will prevent you from creating one. Deleting an overpack unassigns all shipments from it.**Note:** A client won't be able to print an overpack label until at least one shipment is assigned to it.