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