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ISO 8583
We covered the ISO 8583 basics in an earlier article. This post explains the ISO 8583 message structure in detail: every ISO 8583 message consists of three main parts - the MTI (Message Type Indicator), the Bitmap, and the Data Elements.
ISO 8583
F45 (TRACK-1 DAT) carries the Track 1 data of the card in ISO 7813 format, including field separators and start and end sentinels but excluding the LRC character. It is 76 characters long.
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
This guide, prepared in line with the regulation and its annex on TR QR Code principles and rules, gives sample mobile payment flows and defines the TR QR Code data organization for merchant-presented and consumer-presented models.
Laws & Regulations
The Regulation on Generating and Using TR QR Code in Payment Services and its attached TR QR Code Principles and Rules document were published in the Official Gazette No. 31220 dated August 21, 2020, to ensure interoperability in QR code payments.
Laws & Regulations
This guide, aligned with the TR QR Code regulation and its annex, describes the workflows for FAST payments using merchant-presented and person-to-person QR codes and defines the related TR QR Code data organization.
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.
ISO 8583
F55 - INTEGRATED CIRCUIT CARD (ICC) SYSTEM RELATED DATA: the field where EMV data is written on chip cards. It consists of components such as Position, Private Data Subelements, PDS Tag, PDS Length, and PDS Value...
ISO 8583
F35 TRACK-2 DATA: The values printed to the card's Track 2 data in ISO 7813 format, including field separators and start/end sentinels, but excluding LRC (Longitudinal Redundancy Check) characters. It is 37 characters long.
Merchant & POS
DDOL is the list of data a card needs when the DDA method is used during Data Authentication. If the DDOL is not present on the card, the terminal may keep a default DDOL list instead.
Credit Card
The customer's name and surname printed on credit and debit cards is called the emboss name. But can the name be printed on a card without any limit? There is a defined field for all information printed on a card, and these fields have specific standards.
Merchant & POS
Visa's Merchant Data Standards Manual covers classification, identification and data standard requirements for merchants, payment facilitators and marketplaces, including merchant naming, location and MCC rules. Here is what it contains and where to find it.