timeToLive property
The amount of time, in seconds, that APNs should store and attempt to deliver the push notification, if the service is unable to deliver the notification the first time. If this value is 0, APNs treats the notification as if it expires immediately and the service doesn't store or try to deliver the notification again.
Amazon Pinpoint specifies this value in the apns-expiration request header when it sends the notification message to APNs.
Implementation
final int? timeToLive;