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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
In payment systems, an “appeal” is the process of objecting to the outcome of a transaction dispute. It is usually discussed alongside chargebacks, but it plays a critical role in interbank dispute resolution, when a party asks the card scheme to re-evaluate a concluded decision.
Agentic Commerce
The next customer on the internet may not be human. If AI agents become part of purchasing decisions, the rules of e-commerce, marketing, and payment systems could change.
Credit Card
BKM Online is the web-based electronic system that enables communication and information sharing between BKM and its members, including documents, reports, services and work calendars, according to user permissions.
Credit Card
Yes. American Express cards have a 4-digit CVV on the front and a 3-digit CVV on the back, like other cards. Here's how payment forms should handle both formats and why logging the security code is never allowed.
Security
An external network scan run every 3 months by an Approved Scanning Vendor authorized by card schemes such as MasterCard and Visa, required for PCI DSS compliance. It checks whether merchant systems are protected against external threats.
EMV
RID is part of the AID value, which is structured according to ISO/IEC 7816-5 and consists of two sections: a value specific to the application provider, and an optional field used to identify different providers or products.
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.
Merchant & POS
UnionPay International (UPI) is a China UnionPay subsidiary founded in November 2012. Together with more than 1,000 institutions worldwide, UPI provides international card acceptance in 160 countries and card issuance in more than 40 countries and regions.
Online & Authorization
In payment systems, the result of a transaction is sent in the F39 field. The F39 value is the code indicating the transaction's approval or decline status. It is a 2-character alphanumeric code. When approved, the value is usually 00.
Closed-Loop Payments
Is Starbucks really selling coffee, or building an ecosystem? Prepaid balances, a loyalty program and customer data turn a coffee chain's payments into a closed-loop economy, a very different model from Istanbulkart.
HCE
There are three types of PIN strategy in HCE (Host Card Emulation): No PIN, Card PIN and Wallet PIN or customer biometric data. Each balances user experience and security differently.