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How protect file with a unique and secured token? For example my file - ajax.php include_once(dirname(__FILE__) . '/../../config/config.inc.php'); include_once(dirname(__FILE__) . '/../../init.php'); include_once(_PS_MODULE_DIR_.'bonnewsletter/classes/ClassNewsletter.php'); if (Tools::getValue('ajax') == 1) { $email = pSQL(trim(Tools::getValue('bon_newsletter_email', ''))); $check = ClassNewsletter::isNewsletterRegistered($email); if (Tools::isEmpty($email) || !Validate::isEmail($email)) { die(Tools::jsonEncode(array('success' => 3, 'error' => 'Invalid email address.'))); } else { if ($check > 0) { die(Tools::jsonEncode(array('success' => 1, 'error' => 'This email address is already registered.'))); } else { if (!ClassNewsletter::isRegistered($check)) { if (Configuration::get('NW_VERIFICATION_EMAIL')) { if ($check == ClassNewsletter::GUEST_NOT_REGISTERED) { ClassNewsletter::registerGuest($email, false); } } else { ClassNewsletter::register($email, $check); } die(Tools::jsonEncode(array('success' => 0, 'error' => 'You have successfully subscribed to this newsletter.'))); } } } } For any ideas, thank you very much!