When eBay is set up as an extension and you Ship/Process a shipment in the StarShip client, StarShip will update the related eBay Transaction with the Shipped On Date, Shipped flag, Carrier/Service, and Tracking number. This is In addition to the normal write-back of freight charges, etc. to your ERP source interface.
Voiding Shipments
If you void a shipment in StarShip, the eBay fields that were updated will also be deleted from the Transaction.