Amazon Marketplace Web Service (MWS) will no longer be available after March 31, 2024. All MWS developers must migrate to Selling Partner API (SP-API) to avoid service disruptions. Refer to the Migration Hub for more information.
Some items in an Amazon Easy Ship order require serial numbers so that Amazon can generate warranty documents for them. Use the ListOrderItems operation to find out which items require serial numbers.
Amazon returns the items in the order, marking the items that require a serial number with SerialNumberRequired=true.
Amazon generates warranty documents for the items that you specified serial numbers for. For information about getting the documents that Amazon generates when you create a scheduled package, see How to get invoice, shipping label, and warranty documents.