private Code search(String url, int amount, String note)  {
        String response = "";
        try {
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();
            con.setRequestMethod("POST");
            con.setRequestProperty("X-Tebex-Secret", secret);
            //con.setRequestProperty("Accept", "application/json");
            con.setRequestProperty("User-Agent", "Mozilla/5.0");
            //con.setRequestProperty("note", note);
            //con.setRequestProperty("amount", "" + amount);
            //con.setUseCaches(false);
            //con.setDoInput(true);
            //con.setDoOutput(true);
            con.connect();
            //System.out.println(con.getResponseMessage());
            //con.getErrorStream()
            //BufferedReader en = new BufferedReader(new InputStreamReader(con.getErrorStream()));
            //System.out.println("printing erros:");
            //en.lines().forEach(System.out::println);

            InputStream is = null;
            if(con.getResponseCode() == 500) {
                System.out.println("ERROR: 500: "+con.getResponseMessage());
                is = con.getErrorStream();
                BufferedReader in = new BufferedReader(new InputStreamReader(is));
                in.lines().forEach(System.out::println);
                in.close();
                return null;
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            System.out.println("values:: ");
            in.lines().forEach(System.out::println);
            //response = in.lines().collect(Collectors.joining());
            //System.out.println("here");
            //System.out.println("Error Message: "+con.getRequestProperty("error_message"));
            in.close();
            //en.close();
            con.disconnect();
        } catch (IOException e) {
            e.printStackTrace();

        }
        return (Code) gson.fromJson(response, Code.class);
    }