Using NuSoap

I am going to ask you to consider going in a different direction.  Do not use SOAP at all.  Instead choose a RESTful design pattern.

In REST, your authentication will be made with an API key that will be transmitted on every request.  If you put your REST service behind SSL, the API key is pretty safe and secure.

The reason for choosing REST over SOAP is very simple.  REST is easy to use.  SOAP introduces the idea of a "contract" between the services, where each side must do complex actions in certain orders.  This is a sure recipe for confusion as the HUGE number of questions about "Why can't I get SOAP to work?" clearly shows.  In contrast, I never see anyone posting a question at EE about how to get REST to work!

Some examples of successful REST interfaces include the Yahoo and Google Geocoders, and even the client-server nature of the WWW itself.
http://en.wikipedia.org/wiki/Representational_State_Transfer

Here is a little code snippet that will show you a simple REST application.  It takes a first name and returns the last name.  REST applications can return any data string - XML, JSON, and CSV strings are common.

Best of luck with it, ~Ray

<?php // RAY_REST_get_last_name.php
error_reporting(E_ALL);



// DEMONSTRATE HOW A RESTFUL WEB SERVICE WORKS
// CALLING EXAMPLE:
// file_get_contents('http://laprbass.com/RAY_REST_get_last_name.php?key=ABC&name=Ray');



// OUR DATA MODEL CONTAINS ALL THE ANSWERS - THIS COULD BE A DATA BASE QUERY - AS COMPLEX AS NEEDED
$dataModel
= array
( 'Brian'   => 'Portlock'
, 'Ray'     => 'Paseur'
, 'Richard' => 'Quadling'
)
;


// TEST THE API KEY - THE ASSUMPTION IS FAILURE
$key = FALSE;

// IF THE URL CONTAINS THE KEY
if (isset($_GET["key"])) $key = $_GET["key"];

// IF THE KEY FAILS TO MATCH OUR OUR REQUIRED 'ABC'
if ($key !== 'ABC') die('BOGUS API KEY');



// LOOK UP THE LAST NAME - THE ASSUMPTION IS FAILURE
$name="?";

// IF THE URL CONTAINS THE FIRST NAME
if (isset($_GET["name"])) $name = $_GET["name"];

// IF THE URL NAME IS FOUND IN THE DATA MODEL
if (array_key_exists($name, $dataModel))
{
    // RETURNS THE LAST NAME FROM THE DATA MODEL
    die("$dataModel[$name]");
}

// RETURNS THE UNKNOWN NAME INDICATOR
else die('UNKNOWN');

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