Return data to Ajax from PHP file

I have a form that submits data through AJAX to a PHP file.  (register-code.php) ( The PHP file saves the data to a mysql database.  Once the PHP file is completed, I'd like to post an ID number back to the AJAX call to send it to another PHP file where the user will have the option of paying by credit card.  Here's the AJAX code...

submitHandler: function(form) {
            var dataString = $(form).serialize();
                            data: dataString,
                            cache: false,
                            success: function(data){
                            window.location.href = 'registrationComplete.php?ID=$var_id'; 
							error: function( jqXHR, textStatus, errorThrown){
								alert("Error:" +textStatus);

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I can 'echo' the data back to the AJAX function, but how do I pass the ID into registrationComplete.php?

Thanks for all the help in advance.

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success: function(data){
     if(data.status) window.location.href = 'registrationComplete.php?ID=' +; 

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and in register-code.php you've at the end if the registration is complete:
echo '{"status":true,"id":"' . $id . '"}';

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but why not storing this ID in the session, it's more secure?
$_SESSION['id'] = $id;
and just return status (true or false)

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stkoontzAuthor Commented:
Thanks  leakim971.  Sometimes the simplest solution is the best.  The session variable is working great.
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