Amazon Marketplace Web Service (MWS) will no longer be available after December 31, 2023. All MWS developers must migrate to Selling Partner API (SP-API) to avoid service disruptions. Refer to the Migration Hub for more information.
Step 10 - Send your shipments to Amazon's fulfillment network
Send your shipments to Amazon's fulfillment network using an Amazon-Partenered
carrier or a non-Amazon-Partnered carrier that is registered with Amazon. For more
information about sending shipments to Amazon's fulfillment
network, see the Amazon Seller Central Help for your marketplace. For more
information, see Using an Amazon-partnered carrier for your inbound shipment.