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

Step 11 - Mark your shipments as shipped

After sending a shipment to Amazon's fulfillment network, you should call the UpdateInboundShipment operation of the Inbound Shipment API section. Include the ShipmentId that you used when you called the CreateInboundShipment operation for that shipment. Also include the ShipmentStatus request parameter with its value set to SHIPPED. For more information about the Inbound Shipment API section, see Fulfillment Inbound Shipment API. For code samples for calling the UpdateInboundShipment operation, see the Client Library links on the Amazon Marketplace Web Service (Amazon MWS) portal for your region.

For more information, see Fulfillment Inbound Shipment API.