settings.php

См. документацию.

<?php
namespace Bitrix\Main\Filter;
use Bitrix\Main;
 
class Settings
{
    protected $ID = '';
 
    function __construct(array $params)
    {
        $this->ID = $params['ID'] ?? '';
        if($this->ID === '')
        {
            throw new Main\ArgumentException('Collection does not contain value for ID.', 'params');
        }
    }
    public function getID()
    {
        return $this->ID;
    }
}