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Credit Card
PSE (Payment System Environment) is a directory on the card named 1PAY.SYS.DDF01 for a contact chip and 2PAY.SYS.DDF01 for a contactless chip. The Candidate List built via PSE is called indirect or implicit Application Selection.
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.
EMV
DFN is the abbreviation for Dedicated File Name. It defines the name of the DF (Dedicated File) as described in ISO/IEC 7816-4. It is the data found in Tag 84, 5 to 16 characters in length.
EMV
AID tells the terminal which applications are present on a chip when a transaction is performed via POS/ATM. It is a 5-16 digit value in Tag 9F06, used to identify chip applications by card scheme.
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.
ISO 8583
In ISO messaging standards, country codes sent in fields such as F43, F19, F20, and F21 must follow a specific standard. Below is the country code list and details used for ISO, including 2-character, 3-character, and numeric codes.