silentPush

Specifies whether the notification is a silent push notification. A silent (or background) push notification isn't displayed on recipients' devices. You can use silent push notifications to make small updates to your app, or to display messages in an in-app message center.

Amazon Pinpoint uses this property to determine the correct value for the apns-push-type request header when it sends the notification message to APNs. If you specify a value of true for this property, Amazon Pinpoint sets the value for the apns-push-type header field to background.

If you specify the raw content of an APNs push notification, the message payload has to include the content-available key. For silent (background) notifications, set the value of content-available to 1. Additionally, the message payload for a silent notification can't include the alert, badge, or sound keys. For more information, see Generating a Remote Notification and Pushing Background Updates to Your App on the Apple Developer website.

Apple has indicated that they will throttle "excessive" background notifications based on current traffic volumes. To prevent your notifications being throttled, Apple recommends that you send no more than 3 silent push notifications to each recipient per hour.