soap-auth-source.js

var soap = require('soap');
var Cookie = require('soap-cookie');

exports.get = function(req, res){

   var url = 'http://ws.example.com/wsclientPath?wsdl';

   soap.createClient(url, function(err, client) {
       if (err) {
           res.send(err);
       } else {

           var args = {
               customerID: yourID,
               passphrase: "yourPassword",
           };

           client.authenticate(args, function (err, response, headers) {

               if (err){
                   res.send(err);
               } else {

                   var header = client.lastResponseHeaders;
                   client.setSecurity(new Cookie(header)); //authorizatoin

                    //any function here

                     res.send("connected!");

                   });
               }
           });
       }
   });
};