OPPaymentStatus
@objc
public enum OPPaymentStatus : Int, CustomStringConvertibleAn enum representing the status of a payment requested from the user.
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                  The payment succeeded. DeclarationSwift case success
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                  The payment failed due to an unforeseen error, such as the user’s Internet connection being offline. DeclarationSwift case error
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                  The user cancelled the payment (for example, by hitting “cancel” in the Apple Pay dialog). DeclarationSwift case userCancellation
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                  A string representation of this enum DeclarationSwift public var description: String { get }
 OPPaymentStatus Enumeration Reference
        OPPaymentStatus Enumeration Reference