API dla płatności

private static final HashMap<String, String> COOKIES = new HashMap<>();
private static final Pattern KOD = Pattern.compile("[A-Z0-9]{8}");
private static final String USER_AGENT = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/51.0.2704.79 Chrome/51.0.2704.79 Safari/537.36";
//cloudflare blokuje jave
public static class PaymentsResponse {
    public int error;
    public double amount = 0;
    public String wallet_formatted;
}

private static String getRequestCookieString(Map<String, String> req) {
    StringBuilder sb = new StringBuilder();
    boolean first = true;
    for (Map.Entry<String, String> cookie : req.entrySet()) {
        if (!first)
            sb.append("; ");
        else
            first = false;
        sb.append(cookie.getKey()).append('=').append(cookie.getValue());
    }
    return sb.toString();
}

private boolean zaloguj() throws ServletException, IOException {
    Response res = Jsoup.connect("https://lvlup.pro/auth/login").userAgent(USER_AGENT).execute();
    COOKIES.putAll(res.cookies());
    FormElement el = (FormElement) res.parse().getElementsByTag("form").get(0);
    for (Element e : el.elements()) {
        if (!e.tag().isFormSubmittable())
            continue;
        if (e.hasAttr("disabled"))
            continue;
        if (e.attr("name").equals("username"))
            e.val("jakis tam nasz email");
        else if (e.attr("name").equals("password"))
            e.val("jakies tam nasze haslo");
    }
    res = el.submit().userAgent(USER_AGENT).cookies(COOKIES).execute();
    COOKIES.putAll(res.cookies());
    if (res.body().contains("Zaloguj si") || !res.body().contains("Wyloguj")) {
        return false;
    }
    return true;
}

private double sprawdzKod(String kod, int proby) throws IOException, ServletException {
    if (!KOD.matcher(kod).matches())
        return -2;
    HttpURLConnection conn = (HttpURLConnection) new URL("https://lvlup.pro/panel/profile/payments")
            .openConnection();
    conn.setRequestProperty("User-Agent", USER_AGENT);
    conn.setRequestProperty("x-requested-with", "XMLHttpRequest");
    conn.setRequestMethod("POST");
    conn.setInstanceFollowRedirects(false);
    conn.setDoOutput(true);
    conn.addRequestProperty("Cookie", getRequestCookieString(COOKIES));
    conn.getOutputStream().write(("{\"code\":\"" + kod + "\"}").getBytes(StandardCharsets.UTF_8));
    char[] b = new char[8192];
    int n;
    StringBuilder sb = new StringBuilder();
    InputStreamReader isr = new InputStreamReader(conn.getInputStream());
    while ((n = isr.read(b)) != -1)
        sb.append(b, 0, n);
    if (sb.length() == 0) {
        if (proby == 3) {
            throw new ServletException(
                    "Nie mozna sie zalogowac. Zglos blad administratorowi i zalacz ta wiadomosc: "
                            + conn.getResponseCode() + " " + conn.getResponseMessage() + " " + kod + " "
                            + kod.hashCode());
        }
        zaloguj();
        return sprawdzKod(kod, proby + 1);
    }

    PaymentsResponse pr = new Gson().fromJson(sb.toString(), PaymentsResponse.class);
    if (pr == null) {
        if (proby == 3) {
            throw new ServletException(
                    "Nie mozna sie zalogowac. Zglos blad administratorowi i zalacz ta wiadomosc: " + sb.toString());
        }
        zaloguj();
        return sprawdzKod(kod, proby + 1);
    }
    return pr.amount;
}

private HashMap<String, Long> kody = new HashMap<>();