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EMV
The Visa EAS Server (Extended Access Service) is a server used in Visa’s authentication infrastructure. It was developed to run the cardholder authentication process securely between banks and the Visa network, particularly within Visa Secure (3-D Secure 2.x).
Payment Systems
How do banks fund so many points, bonuses, and discounts? This post explains the credit card profitability model: merchant commissions, interchange, interest income, installments, and why campaigns are an investment in transaction volume rather than a cost.
Online & Authorization
When a card transaction is made abroad, banks usually calculate the cost from a percentage commission, a fixed commission, and an exchange rate margin. The flow starts when the customer requests a cash withdrawal at a foreign ATM.
Clearing
The clearing system settles a transaction between two participants when a card from one bank is used at another bank's POS or ATM. Learn about the incoming and outgoing files used in interbank clearing.
EMV
The Application Block command is sent to invalidate the selected application on a card after the card has been issued. Unlike Card Block, it can be reversed.
Credit Card
Card-to-Card Money Transfer (CCMT) lets customers send money 24/7 from a credit, debit, or prepaid card to another card via ATM, internet banking, call center, or mobile app.
Merchant & POS
A PIN pad lets cardholders safely enter their PIN during POS transactions and lets contactless cards be tapped to transfer card data to the POS. Here is how it works.
Merchant & POS
A step-by-step walkthrough of a 100 TL POS sale: end-of-day batch close, clearing through BKM, interchange and merchant commission, and why the merchant gets paid even if the cardholder never pays the card bank.
Online & Authorization
These are codes that communicate the issuer's conditions for approving a transaction online (IAC-Online), for declining it (IAC-Denial), or for declining it when the terminal cannot go online (IAC-Default).
ISO 8583
Fields F4, F5, F6, F49, F50, and F51 are the Amount and Currency fields sent in the authorization message. For example, for a 300 Euro transaction, the amount and currency information sent in these fields is as follows.
Credit Card
Banks increase the variety of their products and services to serve customers better. When introducing new products, they usually issue them under a new BIN. So are there valid rules for obtaining a new BIN (Bank Identification Number)?
Merchant & POS
When a chip card transaction is made at a POS, it may be approved by the card and the POS alone, without reaching any system (issuer or acquirer). When do the issuer and acquirer find out about it?