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Merchant & POS
With the introduction of chip cards into our lives, the terminal needs to verify the credit card before the transaction. So how is this verification performed? The value calculated and sent by the card is called ARQC (Application Request Cryptogram).
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.
Online & Authorization
A reference guide to authorization response codes seen on POS and ATM transactions, with plain-language explanations of what each code means and what to do about it.
EMV
The EXTERNAL AUTHENTICATE command asks the application inside the ICC whether it can verify the cryptogram, and the ICC returns the processing status. Below are the components of the External Authenticate command and what issuer authentication means.
Credit Card
CVR (Card Verification Results) refers to the results of checks performed on the card. In short, it can be described as keeping the card's transaction log. BYTE 1 Bit 8-7: 00 = The second GENERATE AC command returned an AAC cryptogram (decline)...
Online & Authorization
Cardholder verification in EMV is specific to chip cards. One goal of EMV is to minimize card fraud. To do this, three parties must be verified: the bank, the cardholder, and the terminal. One of the data items taken from the card to prove identity is...
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.