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HSM & Security
TPK stands for Terminal PIN Key. It is a data encryption key used to encrypt PINs for transmission between a terminal and the terminal's bank (acquirer) within a local network. Learn how TPK is used in POS and ATM devices.
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.
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.
Credit Card
An installment transaction splits a payment into a set number of installments reflected on the cardholder's statement, when the card and POS bank are the same. For example, a 1000 TL transaction in 5 installments reflects 200 TL per statement period, starting from the first one.
Chargeback
Arbitration, by definition, is a dispute resolution method in which disputes are settled by arbitrators the parties choose themselves, rather than by official courts. In payment systems, it follows a chargeback when the issuer and acquirer cannot agree.
Security
Before 3D Secure 2.0, let's explain what 3D Secure is. 3D Secure is a two-layer payment authentication system that protects both the cardholder and the merchant in online payments. First released by Visa in 1999, it was later adopted by other card schemes…
Chargeback
A good faith review request is a written request that issuers and acquirers send each other to collect on a transaction when the dispute (chargeback) process cannot be run. The requesting party states its grounds.
Payment Systems
How do banks fund so many points, bonuses, and discounts? This post explains the credit card profitability model: merchant commissions, interchange, interest income, installments, and why campaigns are an investment in transaction volume rather than a cost.
Merchant & POS
The Combined Warning List (BUL) lists card numbers the issuer wants blocked (lost, stolen, counterfeit, etc.), which acquiring merchants check within certain limits, at their own risk, when online authorization cannot be obtained.
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 System Institutions
The European Payments Initiative (EPI), formerly known as PEPSI, is an ECB-backed payment integration initiative aiming to build a pan-European payment system and interbank network to rival Mastercard and Visa. Its founding members include BBVA, BNP Paribas, CaixaBank, Commerzbank and others.
Laws & Regulations
A card scheme organization establishes a debit, credit or prepaid card system and authorizes entities to issue cards or sign merchant agreements. Troy, Visa, Mastercard, American Express, JCB and MIR are examples. This post explains how ATM and POS certification works.