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Merchant & POS
In the first post I explained what closed-loop payment systems are and how they differ from open-loop ones. Many of the replies I received boiled down to one question: how do these systems actually work behind the scenes once a QR code is scanned?
Credit Card
A look at the Union Bank RuPay combo card, an unusual design with two chips, two card numbers, two CVV2 values, two magnetic stripes, and two payment schemes combining credit and debit card functions.
Credit Card
Yes. American Express cards have a 4-digit CVV on the front and a 3-digit CVV on the back, like other cards. Here's how payment forms should handle both formats and why logging the security code is never allowed.
Security
Credit cards are one of the most important payment instruments in daily life. As technology advances and mobile payments and ATMs handle nearly all transactions, credit card fraud is also diversifying and increasing.
Payment Systems
The Address Verification Service (AVS) is a fraud prevention system that, when used effectively, can help limit fraud and chargebacks. This post lists the AVS response codes used by AMEX, Mastercard and Visa, with a description of each.
Merchant & POS
The checkout page is where an online purchase is completed, and cart abandonment is highest there. This post lists design tips: support all cards, limit transition pages, show security cues, allow guest checkout and remove distractions.
ISO 8583
F34 — Primary Account Number, Extended: this field is filled when the card number cannot be placed in F2 because it is longer than 19 digits or contains special characters.
HCE
An international standard that defines proximity cards used in Near Field Communication (NFC) and the protocols used to communicate with them. It has 4 parts; Part 4 covers NFC and HCE operations.
Credit Card
ISO/IEC 7811 specifies the requirements for embossed characters on identification cards and is a set of nine standards describing recording techniques on identification cards.
Credit Card
Troy is Turkey's national payment system scheme, short for "Turkiye's Payment Method." When Troy cards first launched, they could only be used domestically. A partnership with Discover later made it possible to use Troy cards abroad as well.
Merchant & POS
Address Verification Service (AVS) is a fraud prevention system that helps limit fraud and chargebacks when used effectively. It verifies that the address a customer enters matches the cardholder's address on file with the issuer.
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.