config.php

См. документацию.

<?php
 
namespace Bitrix\Sender\Integration\Yandex\Master;
 
use Bitrix\Main\Config\Configuration;
 
class Config
{
    public function getPartnerId(): ?int
    {
        return Configuration::getInstance('sender')->get('yandex.integration.widget')['partnerId'] ?? null;
    }
}