public function getAssignedRDFaPayments()
    {
        $oDb = \OxidEsales\Eshop\Core\DatabaseProvider::getDb();
        $aRDFaPayments = [];
        $sSelect = 'select oxobjectid from oxobject2payment where oxpaymentid=' . $oDb->quote(\OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter("oxid")) . ' and oxtype = "rdfapayment" ';
        $rs = $oDb->select($sSelect);
        if ($rs && $rs->count()) {
            while (!$rs->EOF) {
                $aRDFaPayments[] = $rs->fields[0];
                $rs->fetchRow();
            }
        }

        return $aRDFaPayments;
    }