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Credit Card
Credit card fraud is generally committed using the card itself, using card details without the card, via excess or duplicate withdrawals, or by seizing identity information. ATM card trapping is common, since ATMs hold the card during the transaction.
Payment Systems
Chargeback reason codes differ by card scheme. Here is the list of Discover chargeback reason codes and their descriptions, along with how merchants can use them.
ISO 8583
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.
Security
Fraud means obtaining unjust gain by carrying out a transaction at a merchant or ATM using someone else's credit card or debit card, causing a loss to the real cardholder, the merchant, or the bank. So what fraud codes do Visa and Mastercard use?
Credit Card
CVK (Card Verification Key) is the key information used to generate and verify CVV/CVC values, confirming their validity. It is kept as a pair of keys, CVK A and CVK B, encrypted under TMK, ZMK or LMK.
Security
Forgery in card payments means transactions made with card details without the cardholder's knowledge, or purchases with counterfeit or stolen cards. Merchants cannot eliminate fraud and chargeback risk, but they should aim to reduce it to reasonable levels.
EMV
RID is part of the AID value, which is structured according to ISO/IEC 7816-5 and consists of two sections: a value specific to the application provider, and an optional field used to identify different providers or products.
ATM
During an ATM withdrawal, once all checks are complete and the decision to give the money is made, the cash becomes ready to be presented. The distinction matters for whether notes go to the retract or reject bin.
Contactless
You can tell whether a card supports contactless payments by the four wave symbols printed on it. If the wave symbol is present, your card supports contactless transactions. If not, contact your bank for a new card.
Merchant & POS
Mobile phones are entering our lives more every day. One study found people forget their wallets more often than their phones. This post explains how to buy fuel with TOTAL Mobile Payment and BKM Express without getting out of the car.
Credit Card
It is a CVV2/CVC2 code that changes every few minutes instead of the static code printed on the back of a credit card, aimed at reducing fraud risk in CNP (Card Not Present) transactions.
Merchant & POS
DDOL is the list of data a card needs when the DDA method is used during Data Authentication. If the DDOL is not present on the card, the terminal may keep a default DDOL list instead.