PayPal\PayPalAPI\DoCancelReq::toXMLString PHP Method

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