Use this call to do various tasks after the creation of a single line item or multiple line item order.

Typically, this call is used after the order has been paid by the buyer, but it can be called by the seller beforehand. Typical post-payment tasks available in this call include marking the order as paid, marking the order as shipped, providing shipment tracking details, and leaving feedback for the buyer. Use GetOrders to retrieve a list of active and completed orders.