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Illustration representing Merchant Category Code classification for card transactions

Merchant & POS

What Does a Restricted/Prohibited MCC Mean?

The MCC code, or Merchant Category Code, is a 4-digit code used to classify merchants. Some MCC codes are restricted or prohibited, and POS terminals or card transactions may be blocked when such a code is used.

Diagram illustrating an Onus payment transaction between card and POS

Merchant & POS

What does Onus mean?

In the payment systems glossary, some terms are essential, including Onus. Onus literally means "on us" and refers to cases where the card-issuing bank and the POS/ATM bank are the same, meaning no clearing commission applies.

Limit Control System (LKS) diagram

Credit Card

What is LKS (Limit Control System)?

Limit Control System (LKS): A system provided by KKB (Credit Bureau of Turkey) that allows customers' limit details to be checked in real time. It provides member banks (or institutions) with information sharing on consumers' credit card limits. Under the regulation by the BRSA...

Illustration of personal data protection under the Turkish Personal Data Protection Law (KVKK)

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.

Illustration representing electronic payment systems

Payment Systems

What are Payment Systems?

Let's talk about payment systems, which we have heard more about since the internet entered our lives, and the basic structures behind them. The first credit card in the world was used in America in the 1920s.

Visa Merchant Purchase Inquiry (VMPI) process diagram

Fraud

What is Visa Merchant Purchase Inquiry (VMPI)?

Chargeback is the process of refunding a credit card payment when the goods or services that should have been received were not, or when transactions not made by the cardholder are identified. In Turkish it is translated as reversal of presentment.

Stand-in authorization flow diagram

Credit Card

What is Stand-In Authorization?

In the standard authorization flow, the transaction is initiated by the acquirer (POS bank) and forwarded to the issuer (card-issuing institution). The process is completed once the issuer responds. However, this isn't always possible; when the issuer fails to respond, BKM steps in...

Illustration of a stored value card with balance information stored on its magnetic stripe

Debit Card

What Is a Stored Value Card?

A stored value card is a widely used card type today. Instead of being held in a financial system, the monetary balance is stored directly on the card, which has a special magnetic stripe recording important financial data such as the balance.

Diagram explaining the PAN Sequence Number (PSN) field on a chip card

Credit Card

What Is PSN (PAN Sequence Number)?

A 2-character field written to the card's chip data that increases by 1 with each card renewal, allowing authorization to distinguish between the old and new card. This means that, theoretically, assuming no other conditions prevent it, a...

Diagram illustrating clearing types between card-issuing and POS banks

Clearing

What are the Clearing Types?

In card transactions via POS/ATM, when the card-issuing bank differs from the POS/ATM bank (Not Onus), the transaction is subject to clearing. Below, POS can also mean ATM. Is the clearing system a single type? No...