PayPal\PayPalAPI\DoVoidReq::toXMLString PHP Method

    public function toXMLString()
    {
        $str = '';
        $str .= '<ns:DoVoidReq>';
        if ($this->DoVoidRequest != null) {
            $str .= '<ns:DoVoidRequest>';
            $str .= $this->DoVoidRequest->toXMLString();
            $str .= '</ns:DoVoidRequest>';
        }
        $str .= '</ns:DoVoidReq>';
        return $str;
    }