You can store additional metadata with Kustom that will be returned whenever an order is read from Kustom. The data take two forms: two reference fields to be used to store your internal order reference, and general metadata fields on the order and on each order line that can be used to store arbitrary data.
The reference fields areĀ merchant_reference1Ā andĀ merchant_reference2Ā used to store the interal reference to the order.
The general metadata fields areĀ merchant_dataĀ on the order andĀ merchant_dataĀ on each order line.