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Diagram of BKM public collection solutions including transport and payment gateway services

Payment System Institutions

What Are BKM Public Collection Solutions?

BKM (Interbank Card Center) was founded in 1990 to clear and reconcile credit and debit card payments. This post covers its public collection solutions: contactless transport in Konya, SGK premium payments and e-Government gateway fees.

Visa PIN security program guide illustration

Security

What Is the Visa PIN Security Program Guide?

The Visa PIN Security Program Guide describes the security and procedural requirements for acquirers and their agents that process PIN data or manage keys for PINs associated with Visa transactions.

Google Card, the physical payment card Google is reportedly preparing to rival Apple Card

Credit Card

Meet the Google Card!

After Apple Card, announced last March to great fanfare, Huawei said it would issue a card too. Google has now joined the race among tech companies by announcing a new card of its own.

Diagram illustrating the soft chargeback retrieval request process between cardholder, issuer and merchant

Chargeback

What Is a Soft Chargeback?

A soft chargeback, also called a retrieval request, is a request for documents about a transaction the cardholder does not recognize. Learn why customers request them, what information merchants should provide, and why a fast response matters.

Illustration showing a margin added to a foreign currency exchange rate

Merchant & POS

What Is a Marked-Up Exchange Rate?

In payment systems, exchange rate information is used in two places: POS devices that support foreign currency transactions, and credit card transactions made in a foreign currency (usually abroad).

Illustration explaining the authorization process for card payments at POS, virtual POS, and ATM terminals

Merchant & POS

What is Authorization?

The term 'provizyon' comes from French and means obtaining approval for a transaction. In payment systems, authorization confirms that the card, POS, bank account, and transaction limits are sufficient to complete a payment.

Diagram illustrating a bank's OnUs transaction flow and the process of opening ATMs to other banks' cards

ATM

What needs to be done to open ATMs to the use of all bank cards?

Suppose you are a newly established bank, wanting to offer customers all your products and services. Of course, this is not easy. First, the Bank's OnUs transaction processing step must run successfully before other banks' cards can be accepted at the ATMs.

Diagram showing the CAT (Cardholder Activated Terminal) Indicator field used in payment authorization messages

Merchant & POS

What is the CAT (Cardholder Activated Terminal) Indicator?

CAT (Cardholder Activated Terminal) devices are typically unattended terminals that accept various payment cards. These terminals are frequently installed at railway ticket stations, gas stations, toll roads, parking lots, and other commercial locations.

Table of Reimbursement Attribute values used in the clearing process

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.

Illustration of a Zone PIN Key (ZPK) protecting PIN data in a payment network

HSM & Security

What is ZPK (Zone PIN Key)?

ZPK, also known as the PIN Protection Key, is a data encryption key that is distributed automatically and used to encrypt PINs. It is also referred to as the 'Working Key'. This key allows PIN information to be carried securely across the network.