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The 2-character ISO 3166-1 code that identifies the country or region.
Note: The country code for Great Britain isGBand notUKas used in the top-level domain names for that country. Use theC2country code for China worldwide for comparable uncontrolled price (CUP) method, bank card, and cross-border transactions.
stringppaas_common_country_code_v2^([A-Z]{2}|C2)$22