Amazon Services
Amazon Marketplace Web Service (Amazon MWS) Documentation
Amazon MWS Documentation

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.