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