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EMV
The GET DATA command is used to retrieve a primitive data object that is not encapsulated in a record within the current application. It is used to retrieve certain primitive data objects interpreted by the application on the ICC.
Online & Authorization
TLV is a data storage method used to speed up the parsing of data. For example, reading data from a card's chip at a POS and carrying it through authorization uses the TLV structure.
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...
Online & Authorization
The Application Transaction Counter is the number of transactions made with the card so far. It increases by 1 with each transaction and can also be used as a transaction number, making transactions easier to track.