The tracking number associated with one package of a shipment. The seller is responsible for the accuracy of the shipment tracking number, as eBay only verifies that the tracking number is consistent with the numbering scheme used by the specified shipping carrier, but cannot verify the accuracy of the tracking number. This field (along with ShippingCarrierUsed) is required if DisputeActivity is SellerShippedItem.
See the
Field Index to learn which calls use ShipmentTrackNumber.