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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.

ISO 8583 field 19 acquiring institution country code

ISO 8583

ISO 8583 Field Descriptions (F19)

F19 — Acquiring Institution Country Code: the country to which the location of the acquiring bank's device (ATM, POS, etc.) belongs.

Illustration of recurring payments and automatic card collection for subscription businesses

Merchant & POS

Key Points to Watch for in Recurring Payments

Winning customers is one of the most important things in business, but keeping them satisfied matters just as much. If you collect payments at regular intervals, such as monthly, these tips will help you improve the success rate of recurring collections.

Illustration of a customer completing a payment through an online payment link

Merchant & POS

What Are the Advantages of Paying with an Online Payment Link?

Advances in payment systems make shopping safer and easier for customers. For e-commerce sites and brands, offering reliable, practical and fast payment options is a serious advantage. An online payment link is one innovative way to accept payments without a POS device.

Diagram of the chargeback process between cardholder, issuer and acquirer

Chargeback

How to Reduce Chargebacks (For Cardholders)

A chargeback is when a cardholder asks the issuing bank to refund a transaction made without their knowledge. It cannot be prevented entirely, but simple precautions can minimize the risk. Here is how the process works and what cardholders should do.

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...

Application fraud and transaction fraud controls

Fraud

What Are the Types of Fraud Controls?

Fraud controls fall into two main types: application fraud controls, which check card and merchant applications, and transaction fraud controls, which monitor card and POS transactions.

Illustration representing an installment transaction made with a credit card

Credit Card

What is an Installment Transaction?

An installment transaction splits a payment into a set number of installments reflected on the cardholder's statement, when the card and POS bank are the same. For example, a 1000 TL transaction in 5 installments reflects 200 TL per statement period, starting from the first one.