public function create($identity, $service, $total_allowance = false, $analyze_queries = false)
    {

        $params = array(
            'service' => $service,
        );

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

        return $this->_user->post('account/identity/' . $identity . '/limit', $params);
    }