The customer's financial instrument. Use it to add a financial instrument to the customer's PayPal account.
bank_detailsobject<bank_details>[]Optionalidentifiersobject<identifier>[]OptionaltypeenumOptionalbranch_locationobject<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.