public function getProviders($limit = 0, $currency = 'MXN')
    {
        $endpoint = "{$this->apiUrl}/providers";

        if ($limit > 0) {
            $endpoint .= '?order_total='.$limit;
        }

        if ($limit > 0 && !empty($currency) && $currency != 'MXN') {
            $endpoint .= '&currency='.$currency;
        }

        $res = Requests::get($endpoint, [], $this->options);
        $this->validateResponse($res);

        return json_decode($res->body, true);
    }