$request

index.php

<?require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');

use \Bitrix\Main\Loader;
use \Bitrix\Main\Web\Json;
use \Bitrix\Main\Application;
use \F5Studio\Application\Application as App;


$request = Application::getInstance()->getContext()->getRequest();

if($request->isAjaxRequest() && check_bitrix_sessid()){
    if($request->getPost('ID')){
        Loader::includeModule('iblock');

        try {
            App::cancel($request->getPost('ID'));
            echo Json::encode(array(
                'status' => true,
            ));
        }catch (\Exception $e){
            echo Json::encode(array(
                'status' => false,
                'message' => $e->getMessage()
            ));
        }
        exit;
    }
}