Sets whether this conversation notification represents a group (3 or more persons).

group?: undefined | false | true;

An array of messages to display inside the notification.

messages: AndroidMessagingStyleMessage[];

The person who is receiving a message on the current device.

person: AndroidPerson;

If set, overrides the main notification title when the notification is expanded.

title?: undefined | string;

Constant enum value used to identify the style type.

type: MESSAGING;