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Payment Systems
In payment or cash withdrawal transactions, the TR QR Code is generated by the POS or ATM. The card issuing bank must build its systems to read and act on this code. Errors usually stem from mishandling the long and short QR code flows, which are explained here.
Payment Systems
After switching to response code 70 for contactless limit-exceeded cases, we found that some overseas POS devices and acquirers did not handle it as expected. This post covers why the problem lies in the ecosystem and how to address it.
ISO 8583
DE 95, Replacement Amounts, shows the transaction amount information in full or partial reversals. Here are its subfields and how it relates to F4.
Merchant & POS
QR Code is a two-dimensional barcode system developed by Denso Wave, a Toyota subsidiary operating in Japan. Its name comes from the initials of Quick Response. Its content can be any data, including text, a website address, or a video link.
Credit Card
DCI (Debit/Credit Indicator) is a flag that shows whether a transaction was made with a credit card or a debit card. With the arrival of prepaid cards, it began to be used as DCPI (Debit/Credit/Prepaid Indicator). Is DCI sent in the authorization message?
Security
The TBB book 'Fraud Detection and Prevention Methods in Banking' analyzes the types of fraud threatening the banking and finance sector and individuals, with examples from the world and Turkey, and offers protection recommendations. This post explains how to access it.
EMV
BIC stands for Bank Identifier Code. It is the universal bank identification code used for automated processing in banking and related financial environments, identifying banks as specified by the ISO 9362 standard.
Credit Card
An affinity card is a type of credit card issued by a bank that carries the logo of a social organization such as an association, foundation, sports club, or charity (for example, Fenerbahce Bonus). It is similar in structure to a co-branded card.
Credit Card
Debit cards and prepaid cards are generally closed to mail order transactions. Mail order authorization is held on credit cards. Unless specifically requested at application, a card is issued closed to mail order transactions.
ISO 8583
F35 TRACK-2 DATA: The values printed to the card's Track 2 data in ISO 7813 format, including field separators and start/end sentinels, but excluding LRC (Longitudinal Redundancy Check) characters. It is 37 characters long.
Merchant & POS
Terminal Verification Results (TVR): a sequence of bits produced when a terminal reads an EMV card, based on logical checks such as an expired card. This data object is used to decide whether a payment transaction should be accepted online, declined, or allowed to proceed.