public function get($applicationChargeId, array $fields = array())
    {
        $params = array();
        if (!empty($fields)) {
            $params['fields'] = implode(',', $fields);
        }
        $data = $this->request('/admin/application_charges/'.$applicationChargeId.'.json', 'GET', $params);
        return $this->createObject(ApplicationCharge::class, $data['application_charge']);
    }