C9

Card Risk Management Currency Code (M/Chip) is C8's direct currency-side sibling, applying the identical Mastercard-proprietary duplication pattern to currency instead of country - conceptually parallel to the core Transaction Currency Code (5F2A, covered earlier) and related to the Visa-proprietary Application Currency Code (9F51, flagged for human review rather than covered in this batch), which occupies a structurally similar role for a different brand's own risk logic. Like C8, it exists specifically for Mastercard's own M/Chip risk-management checks to consult, not as a substitute for any core currency tag a generic terminal already reads - a card carrying C9 still carries whatever core currency tags apply, with C9 serving M/Chip's proprietary logic on top of that core data. Its source citation carries the same verificar vigencia flag as the rest of this cluster. See Mastercard M/Chip 4 Card Application Specification.