public function sendToOrder($orderId, $phone)
    {
        $endpoint = "{$this->apiUrl}/charges/{$orderId}/sms";
        $data = [
            "customer_phone" => $phone
        ];

        $res = Requests::post(
            $endpoint,
            $this->headers,
            json_encode($data),
            $this->options
        );
        $this->validateResponse($res);

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