Unique ID for the transaction associated with the checkout. For Chinese auctions, the value passed in the TransactionID argument must be 0 or the call will fail with an error. For all other auction types, TransactionID accepts the actual, nonzero transaction ID. Call GetItemTransactionsCall or GetSellerTransactionsCall to determine the correct transaction ID. A transaction is uniquely identified by one of two means: (a) You provide a TransactionID and ItemID. (This is the preferred approach.), OR, (b) You provide a BuyerID and ItemID and eBay identifies only one transaction for that combination (an error is returned if there are multiple transactions for that combination). Note: If all three are provided (that is, BuyerID, ItemID and TransactionID), BuyerID is ignored.
See the
Field Index to learn which calls use TransactionID.