Clearing
What is Reimbursement Attribute?
DE03/Reimbursement Attribute carries the Reimbursement Value of a transaction. BKM uses this information as the basis for calculating interchange fees and charges between member banks.
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"information systems"
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Payment Systems
How Many Merchant Transactions Fail? Are We Checking?
Regularly reporting and tracking how many transactions fail at each merchant matters for both the merchant and the acquirer. BKM error codes tell us why POS transactions fail.
FAST
Which Institutions Can Provide the Easy Address Service?
To offer the Easy Address service, an institution needs approval from the Central Bank of the Republic of Türkiye (CBRT), documented eligibility to participate in FAST or EFT, and completed administrative and technical processes with BKM.
HSM & Security
What is TEE (Trusted Execution Environment)?
A Trusted Execution Environment (TEE) is an environment where executed code and accessed data are isolated and protected in terms of confidentiality (no one has access to the data) and integrity (no one can alter the code or its behavior). We may not realize it, but many…
E-commerce
What Is a Marketplace Solution?
A marketplace solution is a service offered by software that enables communication and data exchange between different marketplaces. It is a multi-vendor online shopping infrastructure, including the payment system, for listing, searching and buying products and services.
ISO 8583
ISO 8583 Field Descriptions (F44)
DE 44 - ADDITIONAL RESPONSE DATA is used to provide other supplementary data that may be needed in authorization, as a response to the authorization message. The Card Authentication Results Code is sent in position 9, and the CAVV Result Code is sent in position 15.
Payment Systems
Dynamic CVM Limit Management Approach: A New Era in Card Security
One of the most notable recent developments in card payments is that contactless limits are no longer fixed and can be managed dynamically per customer. Mastercard and Visa are taking different but complementary approaches, and ISO 8583 may need to evolve with them.
Online & Authorization
What Information Is Needed to Uniquely Identify an Authorization Transaction?
Many fields are sent in the authorization message of a card transaction, one of the most important being the authorization code. On its own it is not enough; together with the STAN and transaction date, the transaction can be found directly.
ATM
What is Cash Trapping?
Cash trapping is a type of ATM fraud in which criminals install a device on the ATM or interfere with its operation to trap dispensed cash, making it difficult to detect until the fraudster returns to retrieve the trapped money.
Merchant & POS
EMV Chip Transaction Processing - What Is Application Selection?
In EMV transactions, Application Selection is the process of choosing among the applications supported by both the card and the terminal. It is the first stage of authorization, so it is very important. This post covers the PSE and List of AIDs methods.
Laws & Regulations
What Is Law No. 5464 on Bank Cards and Credit Cards? What Does It Contain?
The purpose of Law No. 5464 on Bank Cards and Credit Cards is to ensure the card payment system works effectively by regulating the issuance and use of bank and credit cards and the related clearing and netting processes.
ISO 8583
ISO 8583 Field Descriptions (F19)
F19 — Acquiring Institution Country Code: the country to which the location of the acquiring bank's device (ATM, POS, etc.) belongs.