public function getInvoiceAddress()
    {
        if ($this->_aInvoiceAddress == null) {
            $invoiceAddress = \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('invadr');
            if ($invoiceAddress) {
                $this->_aInvoiceAddress = $invoiceAddress;
            }
        }

        return $this->_aInvoiceAddress;
    }