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Merchant & POS
Introduction: When a card (credit card/debit card/prepaid card) is used at an ATM or POS, data must be carried securely between systems. For example, in a store sale, the POS initiates the transaction, which must reach the cardholder's bank intact.
HCE
Token types vary depending on the verification method used in a transaction. In offline transactions, general checks are performed by the mobile app and card reader without any verification in the card system. In online transactions, token verification is sent to and verified by the issuer.
HCE
The token used in HCE transactions contains more than just a new number derived from the card number. It also includes single-use keys, an expiration date, RSA keys and certificates, transaction limits, and an Application Transaction Counter (ATC).
Online & Authorization
A reference guide to authorization response codes seen on POS and ATM transactions, with plain-language explanations of what each code means and what to do about it.
ATM
ATMs are among the channels banks use most to serve customers. Besides being one of the most important channels, because they physically dispense cash and give access to a customer's account, many fraud cases occur at ATMs.
Closed-Loop Payments
Why does a coffee chain build its own loyalty program, and why does a payment app keep adding services? This post looks at how loyalty, data, and new services drive the growth of closed-loop payment systems, and at the financial layers behind that growth.
Payment Systems
In payment systems, an “appeal” is the process of objecting to the outcome of a transaction dispute. It is usually discussed alongside chargebacks, but it plays a critical role in interbank dispute resolution, when a party asks the card scheme to re-evaluate a concluded decision.
Payment Systems
An official BRSA letter to banks announced an update to the PIN-free contactless payment limit. From January 15, 2026, contactless payments of up to 2,500 TL can be made without entering a PIN, up from the current 1,500 TL.
FAST
Request to Pay lets users request payment from people who owe them money through a banking application. The CBRT has expanded the FAST Request to Pay Overlay Service so that corporate users can also use it.
Credit Card
Current information: this post describes the limit that applied at the time of publication. According to a BRSA letter to banks, the PIN-free contactless transaction limit, raised to 750 TL in July 2022, will become 1500 TL from 1 July 2024.
Payment Systems
Open banking opens financial data, under the regulations and with the customer's explicit consent, to third-party service providers through standard APIs. The CBRT has published a guide on payment initiation and account information services, covering licensing and technical certification.
Payment Systems
The communiqué on the information systems of payment and electronic money institutions and the data sharing services of payment service providers was published in Official Gazette No. 31676 on 01.12.2021 and entered into force.