9F3C

Transaction Reference Currency Code names the currency the terminal actually expresses Amount, Reference Currency (9F3A, referenced alongside it, already covered in this dictionary) in - the terminal-side counterpart to the card's own Application Reference Currency (9F3B), used specifically for terminal amount checks like the floor limit comparison rather than for anything the card's own risk logic evaluates. Where 9F3B is a list of currencies the card considers acceptable reference points, 9F3C is the terminal's single, actual choice of which currency it's using for its own internal comparisons in this deployment. A terminal misconfigured with the wrong 9F3C will compute technically valid but practically meaningless comparisons - checking a converted amount against a floor limit that was actually set in a different currency than the terminal thinks it's comparing against, which produces decisions that look procedurally correct but are substantively wrong. See EMV 4.4 Book 3.