Important Informations; Retrieval Reference Number; Iv. Important Informations - Hypercom Optimum T42 series User Manual

IV. IMPORTANT INFORMATIONS

1. REVERSAL transaction is always OFFLINE.
2. No REVERSAL transaction for International Card Scheme (ICS).
3. PURCHASE ADVICE transaction is always OFFLINE.
4. PURCHASE with CASH BACK is only for SPAN chip card.
5. CASH ADVANCE is not allowed for SPAN, MAESTRO and ELECTRON.
V. Retrieval Reference Number (RRN)
Retrieval Reference Number or RRN is a 12 Alphanumeric character reference
supplied by the system retaining the original source information and used to assist
in locating that information or a copy of it. This Data Element is mandatory for all
financial transaction and reversal messages. The RRN should always be printed in full
on the POS receipt.