Attachments

How do i get the list of attachment in a module ?

        $leads = ZohoManager::useModule('Leads');
        $lead = $leads->getRecord($request->leadid);
        $lead_attachments = $lead->getRelatedListRecords('Attachments');
        $lead =$lead->getkeyValues();

error : Call to undefined method com\zoho\crm\api\record\Record::getRelatedListRecords()
