public function call($url, $method = 'GET', $params = [])
    {
        // Set call parameters
        $params = array_merge($this->params, is_array($params)? $params : []);

        // Setup parameters
        $content = '';
        $queryString = http_build_query($params);
        if ($method === 'GET') {
            $url = $url . '?' . $queryString;
        } else {
            $content = $queryString;
        }

        // Make call
        $result = @file_get_contents($url, false, stream_context_create([
            'http' => [
                'method'  => $method,
                'header'  => 'Content-type: application/x-www-form-urlencoded',
                'content' => $content
            ]
        ]));

        // Return result
        return $result;
    }