Inwise web services use Soap Header for authentication.
Make sure you set the header values before any call to the service.
For faster access when using a large number of repeated requests as in sending messages, you can use our one time login service.

We have several ways for adding a header to the soap message, I've implemented one of them.
We need to create a class that will implement SOAPHandler<SOAPMessageContext>:

package inwise;

/**
*
* @author Tal Giladi
*/

import java.util.List;
import java.util.Set;

import javax.xml.namespace.QName;
import javax.xml.soap.*;
import javax.xml.ws.Binding;
import javax.xml.ws.BindingProvider;
import javax.xml.ws.handler.Handler;
import javax.xml.ws.handler.MessageContext;
import javax.xml.ws.handler.soap.*;

class HeaderHandler implements SOAPHandler<SOAPMessageContext> {


String _username, _password;

public HeaderHandler() {
}

public HeaderHandler(String username, String password) {
this._username = username;
this._password = password;
}


public void setHeader(InwiseWebServicesSoap port) {
Binding bind = ((BindingProvider)port).getBinding();
List<Handler> handlerList = bind.getHandlerChain();
handlerList.add(this);
bind.setHandlerChain(handlerList);
}

public Set<QName> getHeaders() {
return null;
}

public boolean handleMessage(SOAPMessageContext smc) {

try {
SOAPMessage sm = smc.getMessage();
SOAPEnvelope se = sm.getSOAPPart().getEnvelope();

SOAPFactory sf = SOAPFactory.newInstance();
SOAPElement auth = sf.createElement(new QName("http://www.inwise.com/schemas", "SecHeader"));
SOAPElement username = sf.createElement(new QName("http://www.inwise.com/schemas", "username")).addTextNode(this._username);
SOAPElement pass = sf.createElement(new QName("http://www.inwise.com/schemas", "pass")).addTextNode(this._password);

auth.addChildElement(username);
auth.addChildElement(pass);

SOAPHeader sh = se.getHeader();
if (sh == null) {
sh = se.addHeader();
}

sh.addChildElement(auth);

} catch (SOAPException ex) {
ex.printStackTrace();
}

return true;
}

public boolean handleFault(SOAPMessageContext smc) {
return true;
}

public void close(MessageContext messageContext) {
}

}
Now on our code, before calling the operation, we'll use that class:
InwiseWebServices ws = new InwiseWebServices();
InwiseWebServicesSoap inwiseWebServicesSoap = ws.getInwiseWebServicesSoap();

//fill the security header
HeaderHandler hh = new HeaderHandler("myusername", "myPassword");
hh.setHeader(inwiseWebServicesSoap);