Mastercard Reason Code 4871

Like 4870, but specific to chip-and-PIN transactions where PIN verification liability is in question.

A fraudulent chip-and-PIN transaction occurred, and liability shifts based on PIN-verification support at the terminal.

Card-present only, mainly relevant in markets where chip-and-PIN (not chip-and-signature) is standard.

Terminal log showing chip and PIN verification method used.

Running terminals that don't support PIN verification in chip-and-PIN markets.