LaravelFCM\Response\DownstreamResponse::checkMissingToken PHP Method

    private function checkMissingToken($result)
    {
        $hasMissingToken = array_key_exists(self::ERROR, $result) && in_array(self::MISSING_REGISTRATION, $result);
        $this->hasMissingToken = (bool) ($this->hasMissingToken | $hasMissingToken);
        return $hasMissingToken;
    }