Si ça peut aider et intéresser d'autres utilisateurs, voici le code de l'email de notification aux admins avec les champs remplis par l'utilisateur :
<?php
/**
* @package HikaShop for Joomla!
* @version 2.5.0
* @author hikashop.com
* @copyright (C) 2010-2015 HIKARI SOFTWARE. All rights reserved.
* @license GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
*/
defined('_JEXEC') or die('Restricted access');
?>
<?php
echo JText::sprintf(
'HIKA_USER_ACCOUNT_ADMIN_NOTIFICATION_BODY',
$data->name,
$data->username,
$data->email,
$data->address_firstname,
$data->address_lastname,
$data->address_company,
$data->address_post_code,
$data->address_telephone2
);
?>
<br/>
<?php foreach(get_object_vars($data->address_data) as $key => $val):?>
<?php echo "$key : $val"."<br/>"; ?>
<?php endforeach;?>