OptionalappOptionalbuttonsText and icons for up to two notification action buttons.
OptionalcontextAlternate notification content with a lower-weight font.
OptionaleventA timestamp associated with the notification, in milliseconds past the epoch.
OptionaliconA URL to the sender's avatar, app icon, or a thumbnail for image notifications.
OptionalimageA URL to the image thumbnail for image-type notifications.
OptionalisWhether to show UI indicating that the app will visibly respond to clicks on the body of a notification.
OptionalitemsItems for multi-item notifications.
Main notification content.
OptionalpriorityPriority ranges from -2 to 2. -2 is lowest priority. 2 is highest. Zero is default.
OptionalprogressCurrent progress ranges from 0 to 100.
Title of the notification (e.g. sender name for email).
Which type of notification to display.
A URL to the app icon mask.