Gateway-generated transaction identifier returned in the response of the original transaction. This indicates a specific transaction to be returned.
Note: This is the value referred to as GatewayTxnId in other messages.
            Gateway-generated transaction identifier returned in the response of the original transaction. This indicates a specific transaction to be returned.
Note: This is the value referred to as GatewayTxnId in other messages.
| Namespace | http://Hps.Exchange.PosGateway | 
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 TxnId optional txnIdType Simple Type
 
Gateway-generated transaction identifier returned in the response of the original transaction. This indicates a specific transaction to be returned. 
 Note: This is the value referred to as GatewayTxnId in other messages.  | 
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