public function getBelboonParam()
    {
        if ($sBelboon = $this->getSession()->getVariable('belboon')) {
            return $sBelboon;
        }
        if (($sBelboon = \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('belboon'))) {
            $this->getSession()->setVariable('belboon', $sBelboon);
        }

        return $sBelboon;
    }