Optional
sendAn array of information the App Store server records for its attempts to send a notification to your server. The maximum number of entries in the array is six.
Optional
signedA cryptographically signed payload, in JSON Web Signature (JWS) format, containing the response body for a version 2 notification.
The App Store server notification history record, including the signed notification payload and the result of the server’s first send attempt.
notificationHistoryResponseItem