yii\authclient\OAuthToken::getExpireDurationParamKey PHP 메소드

    public function getExpireDurationParamKey()
    {
        if ($this->_expireDurationParamKey === null) {
            $this->_expireDurationParamKey = $this->defaultExpireDurationParamKey();
        }
        return $this->_expireDurationParamKey;
    }