When the card-issuing bank and the POS bank are different:
- First, authorization is obtained,
- Then the clearing process is run to finalize the transaction financially. This situation is called Dual Messaging.
So why is a dual message structure needed?
During authorization, a problem that may occur at the card bank or the POS bank can cause reconciliation discrepancies in transactions. To prevent such discrepancies, transactions are shared through the clearing file.
What happens to transactions that appear in authorization but do not arrive in clearing?
Transactions that have been authorized but whose clearing is not sent within a certain period (usually 7 days) are “Expired” by the issuer bank after some time. For the expired transaction;
- The card’s available limit is opened up by the amount that expired.
- The relevant amount is not reflected in the card’s statement period.
Is debit card clearing also based on the dual messaging structure?
Until 2012, debit card clearing operated on single messaging. In 2012, with the support of BKM, debit (ATM) cards also began operating on the dual message structure.
