C8

Card Risk Management Country Code (M/Chip) is Mastercard's own proprietary country code used by the card's risk-management checks - conceptually the same duplication pattern already documented in this dictionary for Discover's D2 and Visa's 9F57: the same underlying fact as the core Issuer Country Code (9F1A and 5F28, both covered earlier), but defined in Mastercard's own M/Chip specification for its own risk-management logic to consult, alongside rather than instead of the core tags a generic parser already reads. A terminal or analysis tool that only decodes 9F1A and 5F28 will never see C8's value, not because it's missing but because it's a different, scheme-specific field entirely serving Mastercard's own proprietary risk checks. Its source citation, like several of its siblings in this M/Chip cluster, carries a verificar vigencia flag in the underlying acervo, preserved as-is. See Mastercard M/Chip 4 Card Application Specification.