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European Payments Initiative (EPI) overview graphic

Payment System Institutions

What is EPI (European Payments Initiative)?

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.

Visa Merchant Purchase Inquiry (VMPI) process diagram

Fraud

What is Visa Merchant Purchase Inquiry (VMPI)?

Chargeback is the process of refunding a credit card payment when the goods or services that should have been received were not, or when transactions not made by the cardholder are identified. In Turkish it is translated as reversal of presentment.

Architecture of 3DS 1.0 compared with 3DS 2.0, showing the issuer, interoperability and acquirer domains

Security

What Is 3D Secure 2.0?

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…

Payment services defined under Law No. 6493

Laws & Regulations

What Is a Payment Service?

A payment service means the services offered under Article 12(1) of Law No. 6493. Essentially, it is delivering funds received from a sender to a recipient.

Diagram illustrating BKM TechPOS shared POS infrastructure

Merchant & POS

What is BKM TechPOS?

BKM TechPOS is an infrastructure through which card acquirers and POS/cash register manufacturers can interoperate via BKM, letting all participating banks provide card acceptance services on a single device.

Diagram illustrating the retrieval request process in card transactions

Chargeback

What is a Retrieval Request?

A chargeback is when cardholders dispute a transaction made without their knowledge through their card-issuing bank. So what does a Retrieval Request mean? It is essentially a document request related to transactions a cardholder does not recognize on their statement.

Diagram illustrating the soft chargeback retrieval request process between cardholder, issuer and merchant

Chargeback

What Is a Soft 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.

Payment card with an EMV chip

Clearing

What is Chip Condition Code?

Chip Condition Code is a code carried in the F60 (Additional Data) DE14 field during clearing that shows the chip read status. The possible values and their descriptions are listed below.

Diagram of a good faith request exchanged between issuer and acquirer outside the chargeback process

Chargeback

What Is a Good Faith Request?

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.

Illustration showing the reasons a bank may terminate a merchant agreement

Merchant & POS

Under What Circumstances Is a Merchant Agreement Terminated?

Banks check merchants against a termination list before issuing a POS device. Learn the main reasons, such as counterfeit card acceptance, excessive chargebacks, and fraud, that can lead a bank to terminate a merchant agreement.

Diagram illustrating Terminal PIN Key (TPK) usage in POS and ATM devices

HSM & Security

What is TPK (Terminal PIN Key)?

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.