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Credit Card
Published by Mastercard on 24 May 2019, the Data Integrity Monitoring Program monitors transactions (authorization, clearing, chip, chargeback, etc.) in the Mastercard system to reduce erroneous transactions and increase transaction success rates.
ISO 8583
We covered the ISO 8583 basics in an earlier article. This post explains the ISO 8583 message structure in detail: every ISO 8583 message consists of three main parts - the MTI (Message Type Indicator), the Bitmap, and the Data Elements.
Merchant & POS
The batch number is kept on the POS, incremented by 1 at each end of day, used to transfer transactions to the merchant account and for reconciliation. It's tracked on both the POS and the bank's system.
Payment Systems
When POS and HOST transactions don't match at end-of-day, the end-of-day falls into batch upload. This article covers how the POS sends transactions via the 320 message, how HOST responds with 330, and how to monitor and resolve recurring batch upload failures.
Merchant & POS
Multicurrency POS refers to POS devices that can process transactions in foreign currencies (USD, EUR, GBP, etc.) in addition to Turkish Lira. Merchants using a MultiCurrency POS can process transactions in different currencies for international cardholders.
Payment Systems
Every payment transaction completes in seconds, yet dozens of controls run behind the scenes. This post covers the precautions for authorization and clearing, the critical role of reversals, and the financial loss scenarios most often seen in the field.
Merchant & POS
In order for a bank's POS devices to process transactions with payment scheme cards (Visa, MasterCard, Troy, etc.), they must pass certain test and control steps. Visa and MasterCard have test tools that include test cards and test scenarios for this purpose…
Credit 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
Yes. Whether a contactless transaction goes online depends on the limits on the card and the POS: the contactless floor limit, the CVM limit and the contactless transaction limit. A worked example shows how.
Credit Card
In online transactions, a one-time 3D Secure password is sent to the cardholder's phone. Find out who is liable if that password is shared with someone else, and what happens when a transaction is not completed with 3D Secure.
Credit Card
When I think back to the Akbil I used when I first arrived in Istanbul, I think it's fair to say that Istanbulkart has undergone a very significant transformation. Users can now track activity, top up and view balances right from their phones.
ATM
At ATMs, transaction selection and processing are carried out using the buttons on the right and left of the ATM screen. These buttons are called FDK (Function Display Key) buttons. Does every ATM have FDK?