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Payment Systems
Store and Forward (SAF) describes offline transaction processing. It was originally developed when modems were introduced and connections were not always stable, letting terminals store transactions and forward them once connectivity is restored.
Merchant & POS
An offline transaction is one in which the card and POS terminal approve the transaction based on their own parameters, without contacting their banks. Whether contact or contactless, the device decides whether the transaction is processed offline.
Merchant & POS
In EMV transactions, Application Selection is the process of choosing among the applications supported by both the card and the terminal. It is the first stage of authorization, so it is very important. This post covers the PSE and List of AIDs methods.
Payment Systems
The rules in this guide relate to the processing of Transactions and Payment Transactions made with Mastercard-branded cards. Here are the key definitions and where to find the document.
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.
Payment Institutions & E-Money
5 August 2021 was a very important day for Turkish payment systems. The CBRT's amendment to the Communiqué on the International Bank Account Number (IBAN) allows payment institutions and e-money institutions to create IBANs as well. This is...
Payment Systems
Here are the Mastercard and Visa chargeback reason codes that require a cardholder letter and/or supporting documentation, with their descriptions.
Merchant & POS
A PIN pad lets cardholders safely enter their PIN during POS transactions and lets contactless cards be tapped to transfer card data to the POS. Here is how it works.
Chargeback
The MasterCard and Visa chargeback reason codes that always, sometimes or never require a draft retrieval before a chargeback, with their descriptions. Includes Visa codes such as 60, 75, 79 and 81 and MasterCard codes 4801 and 4802.
Credit Card
The Payment Card Industry Data Security Standard (PCI DSS) is a technical and operational standard created by the PCI Committee, formed by internationally recognized payment brands, to ensure data security in card payment systems.
Merchant & POS
CAVV and AAV are verification codes used in 3D Secure transactions to ensure transaction integrity and security. CAVV is used by Visa, while AAV is used by Mastercard.
Merchant & POS
For a transaction to go through clearing, the card-issuing bank and the merchant bank must be different. If they are the same, the transaction is not subject to clearing and is processed directly by the bank.