Notify.php

См. документацию.

<?php
 
namespace Bitrix\Im\V2\Controller;
 
use Bitrix\Im\V2\Chat\NotifyChat;
 
class Notify extends BaseController
{
    public function deleteAllAction(): ?array
    {
        $notifyChat = NotifyChat::getByUser();
 
        if ($notifyChat !== null)
        {
            $notifyChat->dropAll();
        }
 
        return ['result' => true];
    }
}