@objc public var additionalAPIParameters: [AnyHashable : Any]
The raw underlying bank string sent to the server. Generally you should use
bankinstead unless you have a reason not to. You can use this if you want to create a param of a bank not yet supported by the current version of the SDK’s
STPFPXBankBrandenum. Setting this to a value not known by the SDK causes
@objc public var rawBankString: String?