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Check-out button on an online payment screen

Security

What is Check Out?

In online shopping, converting product browsing into a completed sale after a customer visits your site is just as critical. The amount of purchases abandoned due to friction in the online buying process often exceeds successful sales.

Illustration representing a no-show hotel reservation fee

Chargeback

What is No Show?

A no-show fee is the one-night/one-day charge collected by merchants for hotel reservations and car rental bookings that were made but not used, and not canceled when they should have been. It means an unused and uncanceled reservation.

Illustration explaining how post-purchase installment conversion works for credit card payments

Credit Card

What Is Post-Purchase Installment Conversion?

Post-purchase installment conversion lets credit card purchases and cash withdrawals be split into installments afterward for a fee. See the rules and limits banks apply.

Diagram comparing the 3D, 3D Pay, and 3D Pay Hosting payment models

Payment Systems

What are the 3D Secure Payment Models?

In card payment transactions made via a physical POS device, entering the card's PIN keeps the transaction secure, while in virtual POS transactions, security is provided through the 3D Secure flow. Are 3D Secure payment methods standardized? There are 3 different 3D Secure models.

Merchant calling the bank from a POS terminal to report a suspicious Code 10 transaction

Merchant & POS

What is a Code 10 message?

Code 10 is when a merchant suspects the cardholder or the card is counterfeit and calls the card's bank, which then verifies the transaction with the merchant's bank. If staff suspect a card or cardholder, they should call the bank immediately.

Illustration showing the reasons a bank may terminate a merchant agreement

Merchant & POS

Under What Circumstances Is a Merchant Agreement Terminated?

Banks check merchants against a termination list before issuing a POS device. Learn the main reasons, such as counterfeit card acceptance, excessive chargebacks, and fraud, that can lead a bank to terminate a merchant agreement.

Easy Addressing System (KOLAS) participation diagram

FAST

Which Institutions Can Provide the Easy Address Service?

To offer the Easy Address service, an institution needs approval from the Central Bank of the Republic of Türkiye (CBRT), documented eligibility to participate in FAST or EFT, and completed administrative and technical processes with BKM.

Table of chargeback reason codes by payment scheme

Chargeback

What Are the Chargeback Reason Codes by Payment Scheme?

A chargeback is the process of requesting that an amount paid by credit card be refunded, either because the goods or services paid for were not received, or because a transaction is identified as one the cardholder did not carry out.

Illustration representing communication protocols used in POS payment systems

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.

Courier handing a package to a customer for cash-on-delivery payment

Merchant & POS

What Is Cash on Delivery?

Cash on delivery means paying for an online order at the moment of delivery, usually in cash, though some e-commerce sites also accept card payment at the door. It boosts sales and builds trust, but carries risks like missing POS terminals and refused deliveries.

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 showing an authorized card transaction that expires before reaching the clearing file

Credit Card

What does it mean for a card transaction to expire?

Due to how payment systems work, authorization is obtained for a transaction first. For a Not Onus transaction (different card and POS banks), the system waits for it to arrive via the clearing incoming file. If it does not arrive within about a week, the transaction expires.