List<MlCliente> obterClientes ( short CompanhiaConexao, string Utilizador, string
Agente, string NIF, long Cliente, string NomeCliente, string CodigoPostal, string
SufixoPostal, out string MensagemErro, out bool TemErro )

<obterClientePorNIF_BI_Codigo>
  <OutgoingHeaders attr0="MsgHeaderArray" isNull="false">
    <MsgHeaderArray0>
      <Name>SecurityToken</Name>
      <Namespace>ns</Namespace>
      <ItemType>System.String</ItemType>       <Value>D3EEX9IqXZiPd7Zwcrr4VUUAZTbwls4MIHEMTnuBLaFyee0bOPSnnvavvutKG2NSTdy9Xq Hnkxk/mFJXDC2+LsJ+3DuOvpFbfuvHErZbsP36gjarXpAnaHwbNWJvFHPcNMLStmE9eRwxbFQ==</Value>
      <Direction>Outgoing</Direction>
    </MsgHeaderArray0>
  </OutgoingHeaders>
  <MethodParameters>
    <TemMais100Registos>False</TemMais100Registos>
    <MensagemErro isNull="false" />
    <TemErro>False</TemErro>
    <CompanhiaConexao></CompanhiaConexao>
    <NIF></NIF>
    <BI isNull="false" />
    <NomeCliente isNull="false" />
    <Cliente isNull="false" />
  </MethodParameters>
</obterClientePorNIF_BI_Codigo>

$xml='<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
<obterClientePorNIF_BI_Codigo>
<soap12:Header>
      <Name>SecurityToken</Name>
      <Namespace>ns</Namespace>
      <ItemType>System.String</ItemType>
      <Value><obterClientePorNIF_BI_Codigo>
  <OutgoingHeaders attr0="MsgHeaderArray" isNull="false">
    <MsgHeaderArray0>
      <Name>SecurityToken</Name>
      <Namespace>ns</Namespace>
      <ItemType>System.String</ItemType>
   <Value>D3EEX9IqXZiPd7Zwcrr4VUUAZTbwls4MIHEMTnuBLaFyee0bOPSnnvavvutKG2NSTdy9Xq Hnkxk/mFJXDC2+LsJ+3DuOvpFbfuvHErZbsP36gjarXpAnaHwbNWJvFHPcNMLStmE9eRwxbFQ==</Value>
      <Direction>Outgoing</Direction>
  <MethodParameters>
    <TemMais100Registos>False</TemMais100Registos>
    <MensagemErro isNull="false" />
    <TemErro>False</TemErro>
    <CompanhiaConexao></CompanhiaConexao>
    <NIF></NIF>
    <BI isNull="false" />
    <NomeCliente isNull="false" />
    <Cliente isNull="false" />
  </MethodParameters>
</soap12:Body>
<obterClientePorNIF_BI_Codigo>
</soap12:Envelope>';

$headers = array(
    'Content-Type: text/xml; charset="utf-8"',
    'Content-Length: ' . strlen($xml),
    'Accept: text/xml',
    'Cache-Control: no-cache',
    'Pragma: no-cache'
);


$url = "";
$soap_do = curl_init();
curl_setopt($soap_do, CURLOPT_URL,            $url );
curl_setopt($soap_do, CURLOPT_RETURNTRANSFER, true );
curl_setopt($soap_do, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($soap_do, CURLOPT_SSL_VERIFYHOST, true);
curl_setopt($soap_do, CURLOPT_POST,           true );
curl_setopt($soap_do, CURLOPT_HTTPHEADER, $headers);
curl_setopt($soap_do, CURLOPT_POSTFIELDS,    $xml);
curl_setopt($soap_do, CURLOPT_USERPWD, 'user' . ":" . 'pass');
$result = curl_exec($soap_do);
$err = curl_error($soap_do);
print_r($result);