public function get($recurringApplicationChargeId, $usageChargeId, array $params = array())
    {
        $endpoint = '/admin/recurring_application_charges/'.$recurringApplicationChargeId.'/usage_charges/'.$usageChargeId.'.json';
        $response = $this->request($endpoint, 'GET', $params);
        return $this->createObject(UsageCharge::class, $response['usage_charge']);
    }