public function request($url, $params = [], $post = true)
    {
        $this->reset();

        curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($this->ch, CURLOPT_HEADER, false);

        $apiUrl = trim(parent::$instance->params->url, '/') . '/' . $url;

        $headers = [
            //'Content-Type: application/json'
        ];

        if (parent::$instance->params->token) {
            $headers[] = 'Token: ' . parent::$instance->params->token;
        } else {
            $headers[] = 'Authorization: Bearer ' . parent::$instance->params->token;
        }

        curl_setopt($this->ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($this->ch, CURLOPT_POST, $post);
        curl_setopt($this->ch, CURLOPT_URL, $apiUrl);

        if ($post) {
            curl_setopt($this->ch, CURLOPT_POSTFIELDS, http_build_query($params));
        } else {
            curl_setopt($this->ch, CURLOPT_URL, $apiUrl . '?' . http_build_query($params));
        }

        $response = $a = curl_exec($this->ch);

        if (!$response) {
            throw new Exception('Invalid request');
        }

        // converts string to assoc array
        $response = json_decode($response, true);

        if (!$response) {
            throw new Exception('Invalid request');
        }

        if (curl_getinfo($this->ch, CURLINFO_HTTP_CODE) != 200) {
            throw new Exception($this->extractError($response));
        }

        return $response;
    }