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Payment Systems
Every payment transaction completes in seconds, yet dozens of controls run behind the scenes. This post covers the precautions for authorization and clearing, the critical role of reversals, and the financial loss scenarios most often seen in the field.
ISO 8583
DE 52 — Personal Identification Number (PIN) Data: the field that holds the PIN data. PIN verification is carried out based on this field.
Fraud
Fraud management is used to detect possible fraud on customer accounts and provides additional security for transactions when necessary, making it one of the top priorities for banks.
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.
Payment Systems
Digitalization keeps changing the speed and shape of payments. AI-based payment agents pay on their own within user-defined limits and rules, completing transactions without the user initiating any action. This post explains how they work and what to watch for.
HCE
NFC, known as Near Field Communication, is a technology that transfers data wirelessly between devices within 10 cm. It is used for data transfer, device pairing, and as the basis of contactless payments.
HSM & Security
LMK stands for Local Master Key. The Local Master Key (LMK) is the HSM's master key, and all other keys used by the institution are secured under this key. As transaction volume increases, banks often use multiple HSMs to reduce the load on each device.
Credit Card
Legally, e-commerce sites should not store card details in their own systems; they should only use them when sending transactions. Unfortunately, some sites do not follow this rule.
Cryptocurrency
Cryptocurrencies are becoming part of everyday life and are expected to compete seriously with card payments. This glossary explains the key crypto terms, from address, altcoin and arbitrage to halving, mining, proof of stake and stop-loss.
Payment Institutions & E-Money
Open banking means sharing customers' financial information with a third-party fintech company so that a range of banking and financial services can be offered to them. It works through API integrations. This post covers its status in Turkey and the new BRSA regulation.
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.
ATM
RKL is the process of distributing a TMK (Terminal Master Key) to each terminal from a central point. It is used to remotely load keys onto POS and ATM devices, loading TMKs onto an ATM's keypad or activating them on a POS.