ISO 8583
ISO 8583 Field Descriptions (F38)
DE 38 (AUTHORIZATION IDENTIFICATION RESPONSE) is the authorization code generated when a transaction is approved. It is alphanumeric, 6 characters long, and left empty for declined transactions.
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Credit Card
Why do the points I earn differ between transactions made with my card?
You may have noticed that the same transaction amount earns different reward points when paid with a credit card. Have you ever wondered why? The points a card earns are managed within the card bank's authorization system.
Merchant & POS
Can I Make Transactions with Any Card on a POS Terminal?
To accept a card brand such as Mastercard or Visa, a POS must be certified for that brand. Which brands a POS accepts is the bank's decision.
Merchant & POS
How do transactions made via POS get transferred to the merchant account?
Transactions made via POS are kept under a number called the batch number, which increases automatically and arithmetically. This number increases after each end-of-day (batch close) process.
Credit Card
What causes the difference between the Transaction Amount and the Amount Deducted from the Account in foreign transactions?
In foreign transactions the Transaction Amount is taken online from the customer's account, but what matters is the amount transmitted at clearing, so exchange rate fluctuations between the two moments can create risk for the bank.
Clearing
Clearing System Files: Incoming and Outgoing Files
The clearing system settles a transaction between two participants when a card from one bank is used at another bank's POS or ATM. Learn about the incoming and outgoing files used in interbank clearing.
Merchant & POS
Terminal Action Code (TAC)
These are codes placed into the terminal software by the acquirer that govern the rules for whether transactions go online or are declined, covering offline approval, offline decline, and online submission due to issuer risk...
Merchant & POS
What Is MPV (Central POS Database)?
MPV stands for Merkezi POS Veritabanı (Central POS Database), BKM's shared database of all POS terminals operated by its card-accepting members, used for support, statistics, fraud analysis and the Common POS Management System.
Merchant & POS
Can a Contactless Offline Transaction Occur?
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.
Merchant & POS
What Is a Floor Limit?
The floor limit is the value held on the POS that determines the maximum amount for which an offline transaction can be approved. It is managed per terminal and can be updated at any time through the POS parameter management system.
ATM
Why Does an ATM Swallow Your Card?
ATMs make many banking transactions faster and easier, but like any electronic device they can run into trouble, including swallowing your card. Here is why it happens and what to do.
Online & Authorization
Why Do Your Payments Fail? How Funds Confirmation APIs Solve It
You press the pay button and the screen says the transaction failed. Behind that failure are checks on your balance and transaction security. This post explains how funds confirmation APIs work, where they apply, and the situation in Turkey's open banking.