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Author

Arif Ünal

Payment systems expert and technology executive

Arif Ünal is a technology executive with more than 20 years of experience in banking, fintech and payment systems. He writes about card payments (issuing and acquiring), POS, ATM, e-money, FAST and Turkish payments regulation (BRSA and CBRT). He has held senior roles at Finagotech and managed payment systems and digital banking teams at Emlak Katılım, Vakıf Katılım and Türkiye Finans. He holds a B.Sc. in Industrial Engineering from Istanbul University and an M.Sc. in Management Information Systems from Marmara University.

976 articles

Announcement graphic showing the contactless card transaction limit being raised to 500 TL

Credit Card

Contactless transaction limit rising to 500 TL

The BRSA has decided to raise the contactless card transaction limit to 500 TL, effective 1 February. This post explains the change, how PIN entry works above the limit, and how the limit has evolved since 2019.

Contactless payment PIN entry on a POS terminal

Payment Systems

Why Do Some Contactless Payments Require a PIN?

The biggest benefit of contactless payment is completing small transactions quickly. You can pay purchases under 350 TL without a PIN, while purchases above 350 TL require your card PIN.

Illustration for the repeal of the regulation on payment institutions and e-money institutions

Payment Institutions & E-Money

Regulation on Payment Institutions and E-Money Institutions Repealed

The new regulation on payment services and e-money issuance, published on 1 December 2021, repealed the 2014 regulation on payment institutions and e-money institutions and the related information systems communiqué. This post summarizes the change and the Article 33 equity requirement.

POS terminal screen showing the cancellation transaction menu

Merchant & POS

How does the cancellation (void) process work on a POS?

Many transactions are carried out with cards on a POS terminal. Sometimes a transaction must be reversed, and cancellation (void) is one such transaction. A Sale can only be cancelled on the POS before the batch (end of day) is closed; otherwise a refund is needed.

Payment card illustrating magnetic stripe data used for PIN verification

Credit Card

What is PVV (PIN Verification Value)?

PVV is the number encoded on a card's magnetic stripe that allows the cardholder's PIN to be verified by ATMs and POS terminals. It is a 4-digit cryptogram calculated through a cryptographic operation using the PIN and card data. The real result is longer than 4 digits.

Illustration representing the steps involved in launching a new payment card product

Credit Card

What Should Be Considered When Launching a New Product?

The following steps should be followed when launching a new product: decide on the brand, request a new BIN from the scheme (Mastercard, Visa, Troy), define the BIN in the bank's system, generate keys in the HSM, and roll it out after certification.

Diagram illustrating how a bank allocates a credit card limit

Credit Card

What does credit card limit allocation mean?

A credit card is a card whose limit the bank sets after evaluating the customer against criteria such as income, payment history, and credit bureau score.

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