protected function setVerificationCode($code = null)
    {
        $this->{Config::get('verifier.store_column')}  = $code;

        if ($code) {
            $this->{Config::get('verifier.flag_column')} = false;
        } else {
            $this->{Config::get('verifier.flag_column')} = true;
        }

        $this->save();
    }