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ISO 8583
F25 - POINT OF SERVICE (POS) CONDITION CODE is the field that defines the condition under which a POS transaction was performed. Possible values include 00 Normal presentment, 01 Customer not present, 02 Unattended terminal, and more.
Merchant & POS
BKM has changed the domestic transaction flows for contactless transactions above and below the CVM limit. For above-limit transactions, the issuer can now ask the cardholder to re-enter the PIN instead of terminating the transaction after an incorrect PIN (DE39 = 55).
Payment Systems
Regularly reporting and tracking how many transactions fail at each merchant matters for both the merchant and the acquirer. BKM error codes tell us why POS transactions fail.
Cryptocurrency
Cryptocurrencies are becoming part of everyday life and are expected to compete seriously with card payments. This glossary explains the key crypto terms, from address, altcoin and arbitrage to halving, mining, proof of stake and stop-loss.
Chargeback
The chargeback dispute period varies by reason, but it can never exceed 540 days from the date a transaction posted to the card. Within that limit, cardholders generally have up to 120 days to dispute, depending on the type of issue.
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
An APDU is an application-level protocol defined in ISO 7816-4 and used between a smart card and a POS, ATM, etc. There are two types of APDU: Command APDU and Response APDU. The structure of the APDU is given below.
Payment Systems
If users start describing their needs instead of searching for products, one of the internet economy's most fundamental habits could change.
Closed-Loop Payments
In the final post of the closed-loop payments series, the common question behind cards, QR payments, and prepaid balances comes into focus: who manages the customer relationship, and whose ecosystem does the customer stay in?
Closed-Loop Payments
Is Starbucks really selling coffee, or building an ecosystem? Prepaid balances, a loyalty program and customer data turn a coffee chain's payments into a closed-loop economy, a very different model from Istanbulkart.
Payment Systems
How do banks fund so many points, bonuses, and discounts? This post explains the credit card profitability model: merchant commissions, interchange, interest income, installments, and why campaigns are an investment in transaction volume rather than a cost.
Merchant & POS
Partial authorization lets an issuer approve part of the requested amount when the card lacks the full balance, with the rest paid another way. This post covers the technical, receipt, clearing, reconciliation, merchant and certification requirements for acquirers.