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Diagram illustrating the structure of an ISO 8583 message field

ISO 8583

ISO 8583 Field Descriptions (F41)

F41 - CARD ACCEPTOR TERMINAL IDENTIFICATION: the terminal where a transaction took place. An 8-character alphanumeric value generated by the acquirer bank and assigned to the POS, managed as a unique terminal number at the acquirer.

Illustration representing credit card fraud and online payment security risks

Fraud

What is Fraud? What are the Types of Fraud?

With the growth of credit and debit card usage and rising e-commerce transaction volumes, there has been a serious increase in exploiting user negligence to harm customers. Fraud means using someone else's card at a merchant or ATM to gain unjust profit.

Diagram illustrating the EMV Tag-Length-Value (TLV) data structure used in card transactions

Online & Authorization

What are EMV Tags?

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.

Diagram showing how the iCVV code is generated for EMV chip cards

Credit Card

What Is iCVV? How Is It Generated?

iCVV stands for Integrated Circuit Card Verification Value. To prevent fraud, it is a CVV value generated similarly to the card's track data and stored on the card's chip. Visa uses the term iCVV; MasterCard and American Express use their own equivalents.

Diagram of the Shared POS Management System (OPYS)

Merchant & POS

What Is the Shared POS Management System (OPYS)?

Developed by BKM and made available to banks, OPYS centrally supports setting up multi-application POS terminals shared by multiple members, inviting other members, adding or removing them, and managing field company relationships.

Diagram illustrating the Store and Forward (SAF) offline transaction process

Payment Systems

What is Store and Forward (SAF)?

Store and Forward (SAF) describes offline transaction processing. It was originally developed when modems were introduced and connections were not always stable, letting terminals store transactions and forward them once connectivity is restored.

Illustration of a credit card showing standard ISO/IEC 7810 and 7811 design features

Credit Card

What is a Credit Card?

A credit card is a printed card, or a card number with no physical form, that allows the purchase of goods and services or cash withdrawal without using cash. So how are credit card limits set and managed? Setting a limit involves checking many parameters about the customer.

Diagram of ISO/IEC card standards defining credit card dimensions and layout

Credit Card

Standards that define credit card design and operation

When payment systems come to mind, credit cards are usually the first thing people think of. Credit cards are produced according to specific standards, both in visual design and during printing. These standards belong to the ISO/IEC 781X family.

Illustration of a card present transaction being processed at a POS terminal

Security

What is a CP (Card Present) Transaction?

A CP transaction refers to a card transaction in which the card and cardholder are physically present at the location. Card Present transactions occur when the card's magnetic stripe or chip data is read by a POS terminal or ATM, or via contactless.

TreeCard wooden bank card made from sustainably sourced cherry wood

Credit Card

Can a card be made from wood?

While the use of physical cards and POS terminals is gradually declining, positive developments continue, such as the world's first wooden card, TreeCard, backed by the search engine Ecosia and aimed at reforesting the world.

Person reviewing credit card statement mistakes to avoid

Credit Card

Never do these things when using a credit card

Nearly all of us have at least one credit card in our wallet and use credit cards for almost all of our transactions. A credit card is a good tool for tracking spending, but common mistakes can turn it into a serious problem.