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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
If your POS can't start a new transaction, it's likely stuck trying to send a reversal for an earlier transaction. Here are two fixes: one recommended, one risky.
Merchant & POS
What's the difference between a reversal and a cancellation (void)? Both zero out a transaction's financial effect, but they're triggered in very different ways.
ATM
One of the most important things to watch when using an ATM is PIN security. Since ATMs handle customers' cash transactions, it is no surprise they are prime targets for fraudsters.
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.
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.
Chargeback
Chargeback reason codes vary by card scheme. The Amex chargeback reason codes and their descriptions are listed below: American Express Chargeback Reason Codes A01 The charge you submitted did not receive a valid authorization approval code for the amount...
ISO 8583
F90 - ORIGINAL DATA ELEMENTS: the data elements from an original message, designed to identify the transaction in correction or reversal transactions. Subfields: Original MTI, Original DE 11 (STAN), Original DE 7, Original DE 32, Original DE 33.
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.
Agentic Commerce
Can AI Decide on Our Behalf? Letting an AI agent handle research can make life much easier. The real question is where that should stop, and how much decision-making authority we are ready to hand over.
Merchant & POS
The term 'provizyon' comes from French and means obtaining approval for a transaction. In payment systems, authorization confirms that the card, POS, bank account, and transaction limits are sufficient to complete a payment.
EMV
The Application Block command is sent to invalidate the selected application on a card after the card has been issued. Unlike Card Block, it can be reversed.