Common response fields for all payment methods.
country_codestring<country_code-2>OptionalNote: The country code for Great Britain isGBand notUKas used in the top-level domain names for that country. Use the `C2` country code for China worldwide for comparable uncontrolled price (CUP) method, bank card, and cross-border transactions.
product_codeenum<credit_product_button_code>Optional