ISO 8583
ISO 8583 Field Descriptions (F34)
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.
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ISO 8583
ISO 8583 Field Descriptions (F32)
F32 - ACQUIRING INSTITUTION IDENTIFICATION CODE: the 11-digit acquirer bank ID. The values it can take for domestic transactions and by card brand include Visa, MasterCard, UnionPay, Discover and JCB formats.
Credit Card
What Is the Difference Between CVV and CVV2?
CVV (CVC) and CVV2 (CVC2) are two terms that cardholders often confuse. Both are used for verification in card transactions, but there are notable differences between them, such as where each is printed and which transactions use it.
Payment Systems
What are Payment Systems?
Let's talk about payment systems, which we have heard more about since the internet entered our lives, and the basic structures behind them. The first credit card in the world was used in America in the 1920s.
HSM & Security
What is RSA (Rivest, Shamir, Adleman) Key?
RSA, first used by Rivest, Shamir and Adleman, is a security algorithm used in digital cryptography. RSA differs from older symmetric algorithms because it enables digital signing and advanced encryption for e-commerce systems and high-profile institutions.
ISO 8583
ISO 8583 Field Descriptions (F22)
F22 - POINT OF SERVICE ENTRY MODE: This field holds how the transaction was performed via the POS/ATM and the PIN entry capability of the POS device. The first 2 digits show how the transaction was performed, and the last digit (shown as x) carries the POS's PIN entry capability. Numeric...
Closed-Loop Payments
Is Starbucks Selling Coffee, or Building an Ecosystem? | Closed-Loop Payments #4
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.
Merchant & POS
What Happens Behind the Scenes When a QR Code Is Scanned? | Closed-Loop Payments #2
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?
Laws & Regulations
What Are the Visa Core Rules and Visa Product and Service Rules Documents? How Can I Access Them?
The Visa Core Rules and Visa Product and Service Rules documents define the fundamental rules that apply to all institutions in the Visa network. They are updated regularly, and all members are expected to follow the latest version.
Merchant & POS
What Are POS Sub-Protocols and Their Use Cases in Turkey?
In payment systems, every exchange between POS devices and bank or payment institution systems runs on a specific messaging standard, generally based on ISO 8583. However, each country, bank, or switch network defines its own version of this standard.
Merchant & POS
What Is Partial Authorization?
Partial Authorization lets an issuer approve part of a transaction instead of declining it when the balance or limit is insufficient. This post covers how it works in ISO 8583, whether it is mandatory, and why it matters for the business.
ATM
Today Is the Anniversary of the ATM Entering Our Lives!
The first device that can truly be called an ATM was produced by De La Rue for Barclays Bank and put into service in Enfield, London, on 27 June 1967. The ATM came to Türkiye in 1982.