A list of buttons to display below the notification text.
Notifications support up to four buttons. Attempting to add more than four will result in the notification being rejected by the service.
Application-defined context data that can be attached to buttons on notifications.
When using forms, form data submitted will be written to customData and returned to your app by
listening to the submit notification-action with the trigger {@link ActionTrigger.SUBMIT|submit}.
A unique identifier for the notification.
Mandatory field for Notification updates.
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