docs: public NotificationArea readNotificationArea(InputStream in) throws ConversionException, IOException {
          JSONObject json = parseObject(in);
          NotificationArea ret = new NotificationArea();
          ret.registrationsURL = readStringInternal(json.get(N_REGISTRATIONS));
          ret.serverRegistrationsURL = readStringInternal(json.get(N_SERVERREGISTRATIONS));
          ret.inboxURL = readStringInternal(json.get(N_INBOX));
          ret.clientURL = readStringInternal(json.get(N_CLIENT));
          return ret;
      }