OPCardField
@objc
public enum OPCardField : Int, CustomStringConvertibleRepresents the different credit card fields
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                  The card’s number field DeclarationSwift case number
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                  The card’s expiration field DeclarationSwift case expiration
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                  The card’s security code (CVV) field DeclarationSwift case cvc
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                  The card’s postal code field DeclarationSwift case postalCode
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                  An unknown card field DeclarationSwift case unknown
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                  A string representation of the card field DeclarationSwift public var description: String { get }
 OPCardField Enumeration Reference
        OPCardField Enumeration Reference