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Payment Systems
In payment or cash withdrawal transactions, the TR QR Code is generated by the POS or ATM. The card issuing bank must build its systems to read and act on this code. Errors usually stem from mishandling the long and short QR code flows, which are explained here.
Fraud
With the growth of credit and debit card usage and rising e-commerce transaction volumes, there has been a serious increase in exploiting user negligence to harm customers. Fraud means using someone else's card at a merchant or ATM to gain unjust profit.
Clearing
The Domestic Clearing and Settlement System (YTH) settles and clears transactions between two banks when a card from one bank is used at another bank's POS or ATM. Participants submit records that are cleared daily and multilaterally netted and reconciled.
HSM & Security
White Box Cryptography (WBC) is an important technology used to minimize security risks for open devices such as smartphones. It is a new technique against attacks targeting white-box attack environments.
FAST
The FAST limit, which was decided on 4 August 2021 to be raised to 2,000 TL, has been raised to 2,000 TL as of today. Instant payment volumes are expected to grow further as EFT volumes decline.
FAST
The CBRT has raised the FAST transaction amount limits. As of 4 April 2024, the limit is 100 thousand TL for money transfers and 250 thousand TL for merchant payments made with the FAST-TR QR code.
FAST
The limit in FAST, the CBRT's new instant payment system launched on 8 January, started at 50 TL. It was raised to 250 TL on 14 January and 500 TL on 21 January, and will be raised to 1,000 TL on 28 January.
Credit Card
In online transactions, a one-time 3D Secure password is sent to the cardholder's phone. Find out who is liable if that password is shared with someone else, and what happens when a transaction is not completed with 3D Secure.
ISO 8583
F90 - ORIGINAL DATA ELEMENTS: the data elements from an original message, designed to identify the transaction in correction or reversal transactions. Subfields: Original MTI, Original DE 11 (STAN), Original DE 7, Original DE 32, Original DE 33.
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.
FAST
New banks are added to the Easy Address system every day. Here is the list of banks that supported the Easy Address System at the time, and where to find the current list.
HSM & Security
ZPK, also known as the PIN Protection Key, is a data encryption key that is distributed automatically and used to encrypt PINs. It is also referred to as the 'Working Key'. This key allows PIN information to be carried securely across the network.