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ISO 8583
We covered the ISO 8583 basics in an earlier article. This post explains the ISO 8583 message structure in detail: every ISO 8583 message consists of three main parts - the MTI (Message Type Indicator), the Bitmap, and the Data Elements.
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.
ISO 8583
F54 - ADDITIONAL AMOUNTS is the additional amount field used in transactions. It can take different values depending on the transaction, such as carrying account balance information for balance inquiries.
Chargeback
A soft chargeback, also called a retrieval request, is a request for documents about a transaction the cardholder does not recognize. Learn why customers request them, what information merchants should provide, and why a fast response matters.
ISO 8583
F42 - CARD ACCEPTOR IDENTIFICATION CODE: the merchant number of the terminal where a transaction took place. It is a 15-character alphanumeric value. Transactions are settled to the merchant's account based on the merchant number in this field.
Payment Systems
The rules in this guide relate to the processing of Transactions and Payment Transactions made with Mastercard-branded cards. Here are the key definitions and where to find the document.
Payment Systems
PA DSS (Payment Application Data Security Standard) is a global security standard created by the PCI SSC. Even if you do not need to comply with it, PA DSS remains a valuable guide for auditing and building secure payment applications.
ISO 8583
F19 — Acquiring Institution Country Code: the country to which the location of the acquiring bank's device (ATM, POS, etc.) belongs.
Credit Card
The Chargeback Document Management System (CDYS) is a system developed by BKM to resolve customer disputes over card payment transactions among BKM members, covering Copy Request, Chargeback, Representment, and related processes.
Security
Forgery in card payments means transactions made with card details without the cardholder's knowledge, or purchases with counterfeit or stolen cards. Merchants cannot eliminate fraud and chargeback risk, but they should aim to reduce it to reasonable levels.
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.
Payment Systems
TCR stands for Transaction Record Component, the packets that carry transaction information in a clearing system. Transaction types in a clearing file are distinguished by transaction code and usage code values, and this data is sent inside TCR packets.