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EMV
The EXTERNAL AUTHENTICATE command asks the application inside the ICC whether it can verify the cryptogram, and the ICC returns the processing status. Below are the components of the External Authenticate command and what issuer authentication means.
Merchant & POS
BKM publishes card usage data every three months. In the first half of 2020, card payments reached TL 500 billion, contactless payments tripled, and online card payments surged in the electronics and clothing sectors.
Credit Card
Many people who appear as credit card victims in the news and on social media run into trouble because they think their credit limit is unlimited and forget it must eventually be repaid. A credit card is the best payment instrument, if you know how to use it.
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.
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.
Payment Systems
After switching to response code 70 for contactless limit-exceeded cases, we found that some overseas POS devices and acquirers did not handle it as expected. This post covers why the problem lies in the ecosystem and how to address it.
Merchant & POS
Recurring billing is the automatic collection of payments at set intervals and amounts by storing the customer's card details on a secure, PCI DSS-certified infrastructure.
Fraud
Fraud controls fall into two main types: application fraud controls, which check card and merchant applications, and transaction fraud controls, which monitor card and POS transactions.
ISO 8583
F14 - DATE, EXPIRATION DATE: the expiration date printed on the card by the issuing bank, a 4-digit numeric value in YYMM format. See how it's checked and why the YYMM order matters.
Payment Systems
Chargeback reason codes differ by card scheme. Here is the list of Discover chargeback reason codes and their descriptions, along with how merchants can use them.
Credit Card
CVK (Card Verification Key) is the key information used to generate and verify CVV/CVC values, confirming their validity. It is kept as a pair of keys, CVK A and CVK B, encrypted under TMK, ZMK or LMK.
Credit Card
SDA (Static Data Authentication), DDA (Dynamic Data Authentication), and CDA (Combined Dynamic Data Authentication) are offline data authentication methods used in chip cards. Learn how each one validates the card and the transaction.