The act of making a purchase using a credit card triggers a complex process where data is sent from the customer's credit card to the merchant's POS device, and then to the cardholder's bank - all in the span of a few seconds. In fact, swiping or tapping a credit or debit card and signing the receipt are just the first and final steps of credit card processing.
A comprehensive breakdown of this process can be summarized in 3 stages.
1. Payment AuthorizationThe first stage of any credit card transaction is payment.
- In the store, the customer pays by either swiping (magnetic stripe), tapping (contactless card), or dipping (EMV chip cards) their card. They can also use a digital wallet linked to their credit card, like Apple Pay.
- Online, the customer inputs their credit card details into a payment form on an app or website.
- For phone transactions, a virtual terminal provides secure credit card processing.
The merchant's credit card terminal or website sends the cardholder's details, including the credit card number, expiration date, security code, and payment amount to the store's acquiring bank or processor. This information is forwarded to the appropriate credit card network (e.g. Visa, Mastercard), which then passes it on to the customer's issuing bank for authentication.
2. Payment AuthenticationThe issuing bank receives the payment request and verifies whether the cardholder has the available balance to make the purchase. The bank will also conduct security measures to authenticate the cardholder's details and determine whether the transaction shows any signs of fraudulent activity.
If everything is confirmed to be genuine, the bank account approves the transaction and communicates this to the payment processor and then to the credit card reader or terminal.
3. ClearingThe clearing stage is when details of the transaction are sent to the cardholder and merchant services in the form of statements. At the end of every business day, the merchant sends a batch of approved credit and debit card transactions to the acquiring bank or processor.
The card processing company then forwards details of each transaction to the corresponding credit card network, which then forwards it to the appropriate card-issuing bank. Funds and shares of transaction fees are moved between banks, credit card networks, and acquiring processors to keep the system running.