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HSM & Security
TAK stands for Terminal Authentication Key. It is the data encryption key used to generate and verify a Message Authentication Code (MAC) for data communication between a terminal and the acquirer within a local network.
Credit Card
Card-to-Card Money Transfer (CCMT) lets customers send money 24/7 from a credit, debit, or prepaid card to another card via ATM, internet banking, call center, or mobile app.
Merchant & POS
In daily credit card purchases, the POS produces two receipts: the Customer Copy and the Merchant Copy. The cardholder gets the customer copy; the merchant keeps its own copy by law.
Online & Authorization
In EMV, data is stored in Tag-Length-Value (TLV) format, and it is carried between the card, the POS terminal, and the authorization system in this same format. This post lists every EMV Tag, its type, and its description.
EMV
The history of EMV versions is given below: EMV was standardized in 1995. EMV 3.0, released in 1996, was the first widely used version, commonly known as EMV '96. In 1998, additions were made to EMV 3.0.
Credit Card
Credit cards and POS are two core products banks offer customers. At first glance, credit cards seem to generate no return beyond interchange fees, card fees, and late fees.
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.
HCE
A tokenized card number replaces a physical card number so transactions can be carried out securely. It is generated by the TSP (Token Service Provider), used by the cardholder or merchant, and travels across the payment systems network.
Credit Card
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.
Merchant & POS
Pre-authorization closing turns a pre-authorized transaction into a financial one, posting it to the merchant and cardholder accounts. See how amounts and available limit are affected.
Credit Card
Pre-authorization reduces the merchant's risk by blocking part of the card's limit for a set period. Since a credit card has a defined limit, an amount can be blocked against it. ATM cards and prepaid debit cards have no such limit to block.
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.