The retrieval reference number (RRN) used to identify a transaction.
This property is used to specify the retrieval reference number (RRN) for the transaction that you wish to retrieve or adjust. This value is used by the Host Capture system to identify the transaction.
Note either RetrievalNumber or TransactionNumber may be used to reference the transaction that is to be retrieved, adjusted or voided. If both are supplied, the RetrievalNumber will be used and the TransactionNumber ignored.
In the case of performing level 3 or settlement transactions, TransactionNumber is not supported and thus RetrievalNumber must be used to reference the transaction.