private function fetch($method, $url, $call, array $params = array())
    {
        // Make the API call via the consumer
        $response = $this->OAuth->fetch($method, $url, $call, $params);
        
        // Format the response and return
        switch ($this->responseFormat) {
            case 'json':
                return json_encode($response);
            case 'jsonp':
                $response = json_encode($response);
                return $this->callback . '(' . $response . ')';
            default:
                return $response;
        }
    }