docs: public Device registerDeviceForPush(UUID deviceId,
                                          String notifier,
                                          String token,
                                          Map<String, Object> properties) {
        if (properties == null) {
            properties = new HashMap<String, Object>();
        }
        String notifierKey = notifier + ".notifier.id";
        properties.put(notifierKey, token);
        return registerDevice(deviceId, properties);
      }