protected function _unsetPaymentErrors()
    {
        $iPayError = \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('payerror');
        $sPayErrorText = \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('payerrortext');

        if (!($iPayError || $sPayErrorText)) {
            $iPayError = \OxidEsales\Eshop\Core\Registry::getSession()->getVariable('payerror');
            $sPayErrorText = \OxidEsales\Eshop\Core\Registry::getSession()->getVariable('payerrortext');
        }

        if ($iPayError) {
            \OxidEsales\Eshop\Core\Registry::getSession()->deleteVariable('payerror');
            $this->_sPaymentError = $iPayError;
        }
        if ($sPayErrorText) {
            \OxidEsales\Eshop\Core\Registry::getSession()->deleteVariable('payerrortext');
            $this->_sPaymentErrorText = $sPayErrorText;
        }
    }