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"IAC"

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Photo of a POS terminal related to EMV Issuer Action Code settings

Online & Authorization

Issuer Action Code (IAC)

These are codes that communicate the issuer's conditions for approving a transaction online (IAC-Online), for declining it (IAC-Denial), or for declining it when the terminal cannot go online (IAC-Default).

Photo of a POS terminal related to Terminal Action Code settings

Merchant & POS

Terminal Action Code (TAC)

These are codes placed into the terminal software by the acquirer that govern the rules for whether transactions go online or are declined, covering offline approval, offline decline, and online submission due to issuer risk...

Diagram illustrating the structure of the AFL (Application File Locator) field on an EMV card

Merchant & POS

What is AFL (Application File Locator)?

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.

POS terminal used for EMV card payment processing

Merchant & POS

TVR (Terminal Verification Results)

Terminal Verification Results (TVR): a sequence of bits produced when a terminal reads an EMV card, based on logical checks such as an expired card. This data object is used to decide whether a payment transaction should be accepted online, declined, or allowed to proceed.