The payer information.
email_addressstring<email_address>Optionalphone_numberobject<phone>Optionalcountry_codestringRequirednational_numberstringRequiredpayer_nameobject<name>Optionalcountry_codestring<country_code>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.
addressobject<address>OptionalstatestringOptionalcountry_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.