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ATM
A Bitcoin ATM (BTM) is a specialized kiosk designed for Bitcoin transactions, letting users buy and sell Bitcoin. General features: it enables Bitcoin purchases and sales, and while it visually resembles traditional ATMs...
Fraud
Recently the following news story appeared in the papers. Two things stood out: the hacker was a former banker, and the device he used to clone cards. In banking fraud, insiders who know the system's weak points can build schemes customers never notice.
Fraud
Card skimming is the theft of card information by copying it with the help of a device. Because data inside the chip is very difficult to steal, chip cards are far more secure than magnetic-stripe cards. Turkey is very advanced in card security technology.
ATM
ATM stands for Automated Teller Machine, an electronic device that lets customers carry out account transactions with or without a card. It was invented in 1960 by John Shepherd-Barron. The first ATM in Turkey was installed in 1982.
ISO 8583
Fields F4, F5, F6, F49, F50, and F51 are the Amount and Currency fields sent in the authorization message. For example, for a 300 Euro transaction, the amount and currency information sent in these fields is as follows.
ISO 8583
Currency information for card transactions is sent in fields F49, F50 and F51. The ISO currency values that can be sent in field F49, which carries the original currency value, are listed below.
Credit Card
Visa, Mastercard, and TROY logos on a card represent the payment scheme behind it. Learn what these brands actually do and how a new BIN gets certified.
Merchant & POS
A contactless offline transaction can occur. If the amount is lower than the floor limit defined on the POS and the card also allows offline authorization, the transaction can be completed offline. Offline transactions are periodically sent by the POS to the acquiring bank.
ISO 8583
F47-ADDITIONAL DATA (NATIONAL) is the field reserved for domestic additional information. In Turkey, it carries the BKM Unique ID in authorization transactions and data specific to KKPT (card-to-card transfer) transactions.
Payment Systems
If users start describing their needs instead of searching for products, one of the internet economy's most fundamental habits could change.
Credit Card
The BRSA raised the card limit threshold used to set the minimum payment rate from TRY 50,000 to TRY 100,000. This post explains what changed, why now, the short-term relief, the risk of carried-over balances, and which data to watch.
Payment Systems
An official BRSA letter to banks announced an update to the PIN-free contactless payment limit. From January 15, 2026, contactless payments of up to 2,500 TL can be made without entering a PIN, up from the current 1,500 TL.