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  Canceled
    (out) Status indicating the notification was cancelled. This can be caused by multiple reasons, such as the destination being marked down or an unknown system error.
  CustomCode
    (out) Reserved for future internal or external use
  Delivered
    (out) Status indicating the notification was successfully delivered
  Failed
    (out) Status indicating the notification was failed
  FailedPending
    (out) Status indicating the notification is failed pending
  New
    (out) Status indicating the notification is newly created
  Pending
    (out) Status indicating the notification is pending
  Rejected
    (out) Status indicating the notification was rejected
  Undeliverable
    (out) Status indicating the notification was unable to deliver
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