The payment method to vault with the instrument details.
expirystring<date_year_month>Optionalbrandenum<card_brand>Optionalbilling_addressobject<Portable Postal Address (Medium-Grained)>Optionaladmin_area_1stringOptionalcountry_codestring<country_code>RequiredNote: 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.
network_transaction_referencenetwork_transaction_reference_requestOptionaltokenobject<token_id_request>Optional