How to use the react-native-intercom.registerIdentifiedUser function in react-native-intercom

return async (dispatch: Function) => {
    const { user } = await storage.get('user');
    if (!user) return;
    const { username } = user;
    Intercom.registerIdentifiedUser({ userId: username });
    Intercom.updateUser({ user_id: username, name: username });
    intercomNotificationsListener = ({ count }) => dispatch({
      type: UPDATE_INTERCOM_NOTIFICATIONS_COUNT,
      payload: count,
    });
    Intercom.getUnreadConversationCount()
      .then(count => ({ count }))
      .then(intercomNotificationsListener)
      .catch(() => { });
    Intercom.addEventListener(Intercom.Notifications.UNREAD_COUNT, intercomNotificationsListener);
  };
};