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Logos of various international payment card schemes

Credit Card

What Are National and International Payment Schemes?

In the world of payment systems, just as credit cards are an indispensable product, a payment scheme is indispensable for credit cards. When a credit card product is launched, the scheme it will be issued under is decided first.

Logo and branding of BKM, Turkey's Interbank Card Center

Payment Systems

What is BKM (Interbank Card Center)?

BKM, short for Interbank Card Center, is a legal entity established in 1990 with contributions from 13 public and private Turkish banks to provide clearing and settlement for cards.

Diagram showing different types of POS terminals used for card payments

Merchant & POS

What Is a POS (Point of Sale)?

Virtual or electronic authorization devices connected to a bank, used by merchants to accept card payments. The term comes from the English phrase Point of Sale. Covers POS types by communication method, their advantages, who can use one, and the transactions a POS can perform.

Processing Options Data Object List (PDOL) diagram

Merchant & POS

Processing Options Data Object List (PDOL)

Contains the terminal-resident data objects (tags and lengths) that the ICC needs when processing the GET PROCESSING OPTIONS command. In short, it is the list of information the card requests from the terminal before starting the transaction.

Photo of a POS terminal related to Terminal Action Code settings

Merchant & POS

Terminal Action Code (TAC)

These are codes placed into the terminal software by the acquirer that govern the rules for whether transactions go online or are declined, covering offline approval, offline decline, and online submission due to issuer risk...