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Credit Card
SDA (Static Data Authentication), DDA (Dynamic Data Authentication), and CDA (Combined Dynamic Data Authentication) are offline data authentication methods used in chip cards. Learn how each one validates the card and the transaction.
Online & Authorization
In EMV, data is stored in Tag-Length-Value (TLV) format, and it is carried between the card, the POS terminal, and the authorization system in this same format. This post lists every EMV Tag, its type, and its description.
Credit Card
Yes. A certificate must be generated for every new BIN and loaded onto the card chip, establishing secure communication between the chip and the terminal. This is especially critical for verification in offline transactions.
ATM
Suppose you are a newly established bank, wanting to offer customers all your products and services. Of course, this is not easy. First, the Bank's OnUs transaction processing step must run successfully before other banks' cards can be accepted at the ATMs.
Laws & Regulations
A card scheme organization establishes a debit, credit or prepaid card system and authorizes entities to issue cards or sign merchant agreements. Troy, Visa, Mastercard, American Express, JCB and MIR are examples. This post explains how ATM and POS certification works.
ISO 8583
DE 48 - ADDITIONAL DATA: these are additional data fields that can be used specifically for transactions. It is 255 characters long. Field F48 carries many pieces of information and is divided into PDS (Private Data Subelements).
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.
EMV
The Visa EAS Server (Extended Access Service) is a server used in Visa’s authentication infrastructure. It was developed to run the cardholder authentication process securely between banks and the Visa network, particularly within Visa Secure (3-D Secure 2.x).
EMV
The AID tells the terminal which applications are present on a chip during a POS or ATM transaction. What does the AID do? It lets the terminal determine whether it supports an application on the chip. In Tag 9F06, it is 5-16 digits long.
Credit Card
Most of us are familiar with CVV2/CVC2 - the security code on the back of a card, usually three digits. So what is dCVV2? Here's how dynamic CVV technology works and why Visa introduced it for online payments.
Merchant & POS
A contactless offline transaction can occur. If the amount is lower than the floor limit defined on the POS and the card also allows offline authorization, the transaction can be completed offline. Offline transactions are periodically sent by the POS to the acquiring bank.
Credit Card
CPV stands for Card Personalization Validation. It is Mastercard's term for the set of recommendations and instructions defined for the card personalization process. The equivalent for Visa is called GPR (Global Personalization Requirements).