vendornotification.php

См. документацию.

<?php
namespace Bitrix\Main\Controller\Security;
 
use Bitrix\Main\Engine;
use Bitrix\Main\Security\Notifications\VendorNotificationSignTable;
 
class VendorNotification extends Engine\Controller
{
    public function signAction(string $notificationId): array
    {
        global $USER;
 
        VendorNotificationSignTable::signOrIgnore($notificationId, $USER->getId());
 
        return [];
    }
}