HCE
What Is the ISO/IEC 14443 Standard?
An international standard that defines proximity cards used in Near Field Communication (NFC) and the protocols used to communicate with them. It has 4 parts; Part 4 covers NFC and HCE operations.
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HSM & Security
What Is ZWK (Zone Working Key)?
ZWK stands for Zone Working Key. It encrypts the PIN so that it can travel securely between different financial institutions, such as the acquiring bank and the issuing bank.
Clearing
What is Reimbursement Attribute?
DE03/Reimbursement Attribute carries the Reimbursement Value of a transaction. BKM uses this information as the basis for calculating interchange fees and charges between member banks.
Payment System Institutions
What are the committees in the BKM system?
BKM (Interbank Card Center) works through several committees: Security, Operations and Technology, Market Development, Business Development, Chargeback Rules and Arbitration, ATM Sharing, plus arbitration committees. This post outlines each one's duties.
Fraud
What Are the Types of Fraud Controls?
Fraud controls fall into two main types: application fraud controls, which check card and merchant applications, and transaction fraud controls, which monitor card and POS transactions.
Credit Card
Card Companies Team Up for “One-Click Payment”
American Express, Discover, Visa and Mastercard have started working together on an infrastructure that lets leading US e-commerce sites accept one-click payments, so shoppers no longer need to type in all their card details.
Merchant & POS
What is the Personal Data Protection Law (KVKK)?
The Personal Data Protection Law was adopted by the Grand National Assembly of Turkey on 24/03/2016 and published in Official Gazette No. 29677 on 07/04/2016. It protects individuals' rights in the processing of personal data and sets the rules that data controllers must follow.
Online & Authorization
Application Transaction Counter (ATC)
The Application Transaction Counter is the number of transactions made with the card so far. It increases by 1 with each transaction and can also be used as a transaction number, making transactions easier to track.
ATM
How is PIN verification performed at an ATM?
At payment points such as ATMs and POS terminals, the most critical step is PIN verification or verifying the customer through their identity information. However, since ATMs cannot verify a customer's identity, PIN verification becomes more important. So how is it performed?
Merchant & POS
What Are POS Sub-Protocols and Their Use Cases in Turkey?
In payment systems, every exchange between POS devices and bank or payment institution systems runs on a specific messaging standard, generally based on ISO 8583. However, each country, bank, or switch network defines its own version of this standard.
Credit Card
Can a Card Have CVV Printed on Both Sides?
Yes. American Express cards have a 4-digit CVV on the front and a 3-digit CVV on the back, like other cards. Here's how payment forms should handle both formats and why logging the security code is never allowed.
Merchant & POS
What Is a Contactless Reader?
These are devices connected to a POS terminal that allow fast payments, up to a certain limit, using contactless credit cards or prepaid cards by tapping them on the contactless reader instead of the POS's card reader. Can every POS have a contactless reader attached?