public function update($identity, $service, $total_allowance = false, $analyze_queries = false)
    {
        $params = array();

        if ($total_allowance) {
            $params['total_allowance'] = $total_allowance;
        }
        if ($analyze_queries) {
            $params['analyze_queries'] = $analyze_queries;
        }

        return $response = $this->_user->put('account/identity/' . $identity . '/limit/' . $service, $params);
    }