Airship provides a set of standard Interactive Notification types
(See: Built-In Interactive Notification Types). It is the
type that determines which buttons and corresponding labels
will be available when you send a push. See the next section for where to
specify that in the push payload. You control what happens
when you send the push separately, by tying each button ID to a specific action.
In order to define a custom Interactive Notification type, you must register
a new category.
Airship reserves category IDs prefixed with ua_. Any custom categories
with that prefix will be dropped.
You can use the hiddenPreviewsBodyPlaceholder argument to specify placeholder text which will be shown instead of the push notification’s body when the user has disabled notification previews for the app.