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Credit Card
The Application Interchange Profile indicates the application functions supported by the card. The AIP values and their descriptions are given below. Where is the AIP found? The AIP is a 2-byte piece of data stored on the card, carried under EMV tag 82.
Merchant & POS
AFL (Application File Locator) is the field that shows where on the card the data needed for the authorization transaction is located. AFL is a list of the application data records on the card, and the terminal uses it to read the application data.
EMV
The EXTERNAL AUTHENTICATE command asks the application inside the ICC whether it can verify the cryptogram, and the ICC returns the processing status. Below are the components of the External Authenticate command and what issuer authentication means.
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.
Merchant & POS
Contains the terminal-resident data objects (tags and lengths) that the ICC needs when processing the GET PROCESSING OPTIONS command. In short, it is the list of information the card requests from the terminal before starting the transaction.