D1

Currency Conversion Table is the actual conversion data M/Chip's own risk logic uses to translate a transaction's currency into whatever currency the card's cumulative offline limits (CA and CB, both covered earlier) are actually expressed in - the concrete lookup mechanism behind the same currency-comparison problem the core Reference Currency tags (9F3A through 9F3D, covered earlier) solve at the terminal level, just implemented as M/Chip's own card-resident table rather than a terminal-side computation. It's related to the Currency Risk Management Currency Code (C9, covered earlier), which names the currency this table's conversions are actually keyed to. Because this is proprietary M/Chip conversion data rather than a core EMV mechanism, a terminal doesn't typically need to read or interpret D1 directly - the conversion happens inside the card's own M/Chip risk evaluation, with D1 being internal state to that evaluation rather than a value the terminal acts on. Its source citation carries the same verificar vigencia flag as its M/Chip siblings in this cluster. See Mastercard M/Chip 4 Card Application Specification.