Refunding a payment

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let userInfo: [AnyHashable: Any] = ["user": "info"]
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let parameters: RefundParameters = RefundParameters(
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  amountInCents: 200,
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  userInfo: userInfo,
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  staffMember: YocoStaff(staffNumber: "1234", name: "Joe Bloggs"),
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  refundCompleteNotifier: { paymentResult in
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    // Get notified immediately when the transaction is complete.
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  }
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)
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YocoSDK.refund(
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  transactionID: transactionID,
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  refundParameters: parameters
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) { (result) in
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  let alert = UIAlertController(
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    title: "Refund Completed", message: "Transaction refunded with result: \(result.result)",
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    preferredStyle: .alert)
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  alert.addAction(
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    UIAlertAction(title: "OK", style: .default) { action in
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      alert.dismiss(animated: true)
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    })
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  self.present(alert, animated: true)
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}