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Diagram showing how card transaction data flows through the ISO 8583 messaging standard

Merchant & POS

What is ISO 8583?

Introduction: When a card (credit card/debit card/prepaid card) is used at an ATM or POS, data must be carried securely between systems. For example, in a store sale, the POS initiates the transaction, which must reach the cardholder's bank intact.

Dictionary and glossary book representing payment systems terminology

Merchant & POS

Terms that should be in your payment systems glossary

Below are the definitions of the cornerstone terms of payment systems, as established by the Banks Association of Turkey (TBB): debit card, credit card, merchant, cardholder, and more.

Illustration of a point-of-sale terminal checking a card against a warning list

Merchant & POS

What is the Combined Warning List (BUL)?

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.

POS payment terminal illustration

Credit Card

What is Dual Messaging?

When the card-issuing bank and the POS bank are different, first obtaining authorization and then running the clearing process to finalize the transaction is called Dual Messaging. So why is a dual message structure needed?

Illustration of a fallback transaction swiping a card's magnetic stripe after a chip read failure

Merchant & POS

What Is a Fallback Transaction?

When a chip can't be read due to a chip fault or the card being inserted incorrectly, the transaction is completed by swiping the magnetic stripe on the right side of the POS. Can chipless cards do fallback?