MCC versus NAICS
MCCs primarily categorize the type of merchant activity used in card payments. NAICS classifies economic activity. Neither necessarily captures every product or funds flow.
Map codes to policy
Group codes into policy categories such as standard, regulated, restricted or prohibited, then define the required next step for each category.
Handle ambiguity
Allow a review outcome where codes are missing, conflicting or too broad. Preserve the original code and the rule version used.