protected function _filterDynData()
    {
        //in case we actually ARE allowed to store the data
        if (\OxidEsales\Eshop\Core\Registry::getConfig()->getConfigParam("blStoreCreditCardInfo")) {
            //then do nothing and reset _blDynDataFiltered
            $this->_blDynDataFiltered = false;

            return;
        }

        $aDynData = $this->getSession()->getVariable("dynvalue");

        $aFields = ["kktype", "kknumber", "kkname", "kkmonth", "kkyear", "kkpruef"];

        if ($aDynData) {
            if (!$this->_checkArrValuesEmpty($aDynData, $aFields)) {
                $this->_blDynDataFiltered = true;
            }
            $aDynData["kktype"] = null;
            $aDynData["kknumber"] = null;
            $aDynData["kkname"] = null;
            $aDynData["kkmonth"] = null;
            $aDynData["kkyear"] = null;
            $aDynData["kkpruef"] = null;
            \OxidEsales\Eshop\Core\Registry::getSession()->setVariable("dynvalue", $aDynData);
        }

        if (!$this->_checkArrValuesEmpty($_REQUEST["dynvalue"], $aFields) ||
            !$this->_checkArrValuesEmpty($_POST["dynvalue"], $aFields) ||
            !$this->_checkArrValuesEmpty($_GET["dynvalue"], $aFields)
        ) {
            $this->_blDynDataFiltered = true;
        }

        unset($_REQUEST["dynvalue"]["kktype"]);
        unset($_REQUEST["dynvalue"]["kknumber"]);
        unset($_REQUEST["dynvalue"]["kkname"]);
        unset($_REQUEST["dynvalue"]["kkmonth"]);
        unset($_REQUEST["dynvalue"]["kkyear"]);
        unset($_REQUEST["dynvalue"]["kkpruef"]);

        unset($_POST["dynvalue"]["kktype"]);
        unset($_POST["dynvalue"]["kknumber"]);
        unset($_POST["dynvalue"]["kkname"]);
        unset($_POST["dynvalue"]["kkmonth"]);
        unset($_POST["dynvalue"]["kkyear"]);
        unset($_POST["dynvalue"]["kkpruef"]);

        unset($_GET["dynvalue"]["kktype"]);
        unset($_GET["dynvalue"]["kknumber"]);
        unset($_GET["dynvalue"]["kkname"]);
        unset($_GET["dynvalue"]["kkmonth"]);
        unset($_GET["dynvalue"]["kkyear"]);
        unset($_GET["dynvalue"]["kkpruef"]);
    }