The Merchant Processing Guru

The Merchant Processing Guru Tip#20: What is the flow of a credit card processing transaction?

When you process a transaction what really happens in those few seconds that you are waiting for an approval or decline on that card? Well, whether you swipe the card or key it in on some other system the flow is the same. A line of communication is opened up and information is sent to the acquiring bank to say that a transaction for this amount on this card holder’s card is being requested for this merchant account. Then the acquirer’s computer will then contact the issuing bank to verify the account information and that the card holder has enough credit for the transaction to be approved. Then the approval is sent back to the acquirer from the issuing bank and the acquirer issues an approval number for the transaction. A receipt is then generated with this information and the transaction is complete. This is called the “front end” of the process.

The “back end” of this process happens at the end of the day where all the transactions from that day are grouped together “batched” and settled through the acquiring bank for deposit into your account. The Acquirer also sends transaction information to MasterCard and Visa on a daily basis, which will reconcile the incoming information and route them to the appropriate card issuers overnight. The card issuer will then post the transaction to the cardholder’s account for payment.