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Once this process is complete, the system automatically identifies the license and binds the product to the specified IP address. This ensures that the license can only be used by authorized users, ensuring security. Customers can also control IP address changes if necessary through the website. This structure allows you, as the seller, to securely manage the license distribution process, while your customers can activate their purchased products quickly and seamlessly.

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License API (Java)

You can edit and include the following code in your project. You can grant access by obtaining an API key from your admin panel. 
package docs.example.license;

import org.bukkit.Bukkit;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.*;
import java.util.Arrays;
import java.util.List;

public final class LicenseChecker {
    private static final String TOKEN       = "TOKEN RECEIVED FROM THE SITE"; 
    private static final String PRODUCT_ID  = "10"; // It will depend on which product.
    private static final int    TIMEOUT_MS  = 8000;

    // https://www.minenix.com/api/license/{TOKEN}/{PRODUCT_ID}/{IP}
    private static String buildLicenseUrl(String externalIp) {
        String base = "https://www.minenix.com"; // Your site address.
        String path = String.format("/api/license/%s/%s/%s",
                urlEncode(TOKEN), urlEncode(PRODUCT_ID), urlEncode(externalIp));
        return base + path;
    }

    public static void run() {
        try {
            sendConsole("§6[LISANS KONTROLCUSU] §fEklenti lisansi kontrol ediliyor.");
            String ip = getExternalIP();
            if (ip == null || ip.isEmpty()) {
                sendConsole("§cDis IP tespit edilemedi. Lisans dogrulamasi atlandi.");
                return;
            }

            String url  = buildLicenseUrl(ip);
            String resp = httpGet(url);
            boolean ok  = resp != null && resp.toLowerCase().contains("true");

            if (ok) {
                printAsciiSuccess();
            } else {
                printAsciiFail();
                Bukkit.shutdown();
            }
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String getExternalIP() {
        List<String> endpoints = Arrays.asList(
                "http://checkip.amazonaws.com",
                "https://api.ipify.org",
                "https://ifconfig.me/ip"
        );
        for (String ep : endpoints) {
            try {
                String s = httpGet(ep);
                if (s != null) {
                    s = s.trim();
                    if (s.matches("\\d+\\.\\d+\\.\\d+\\.\\d+") || s.contains(":")) {
                        return s;
                    }
                }
            } catch (Exception ignored) {}
        }
        return null;
    }

    public static String httpGet(String urlStr) throws IOException {
        HttpURLConnection conn = null;
        BufferedReader reader  = null;
        try {
            URL url = new URL(urlStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(TIMEOUT_MS);
            conn.setReadTimeout(TIMEOUT_MS);
            conn.setRequestProperty("User-Agent", "Zonely-License-Checker/1.0");

            int code = conn.getResponseCode();
            reader = new BufferedReader(new InputStreamReader(
                    code == 200 ? conn.getInputStream()
                                : (conn.getErrorStream() != null ? conn.getErrorStream() : conn.getInputStream())
            ));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null)
                sb.append(line);

            if (code != 200) {
                System.out.println("GET isteği başarısız. Yanıt kodu: " + code);
            }
            return sb.toString();
        } finally {
            if (reader != null) try { reader.close(); } catch (IOException ignored) {}
            if (conn != null) conn.disconnect();
        }
    }

    private static String urlEncode(String s) {
        try { return URLEncoder.encode(s, "UTF-8"); }
        catch (Exception e) { return s; }
    }

    private static void sendConsole(String msg) {
        Bukkit.getConsoleSender().sendMessage(msg);
    }

    private static void printAsciiSuccess() {
        sendConsole("§6");
        sendConsole("§6      __     __               _    _    __   __       ");
        sendConsole("§e     |  \\   /  | _           | \\  | |_ /  \\ /  \\      ");
        sendConsole("§4     | + \\_/ + |(_) ____ ___ |  \\ | (_)\\  _|_  /      ");
        sendConsole("§9     |  \\   /  || || __ / -_|| | \\  | |/   |   \\      ");
        sendConsole("§b     |__|\\_/|__||_||_||_\\___/|_|  |_|_|\\__/ \\__/      ");
        sendConsole("§6");
        sendConsole("§a  EKLENTI LISANSI DOGRULANDI!");
        sendConsole("§6");
        sendConsole("§f  Urun, §alisans §fsunucularimiz tarafindan");
        sendConsole("§f  basariyla dogrulandi. Urun kullanimina hazirdir.");
        sendConsole("§f  Eger bir urunde sorun oldugunu dusunuyorsaniz");
        sendConsole("§6  https://www.minenix.com/support §fkismindan bize");
        sendConsole("§f  destek talebi gonderebilirsiniz.");
        sendConsole("§6");
        sendConsole("§f  Urunu kullanmadan once okuyun;");
        sendConsole("§e  https://www.minenix.com/terms/sale");
        sendConsole("");
        sendConsole("§b  wCore vX.Y.Z §feklentisini kullandiginiz");
        sendConsole("§f  icin ve bizi desteklediginiz tesekkurler!");
        sendConsole("");
    }

    private static void printAsciiFail() {
        sendConsole("§6");
        sendConsole("§6      __     __               _    _    __   __       ");
        sendConsole("§e     |  \\   /  | _           | \\  | |_ /  \\ /  \\      ");
        sendConsole("§4     | + \\_/ + |(_) ____ ___ |  \\ | (_)\\  _|_  /      ");
        sendConsole("§9     |  \\   /  || || __ / -_|| | \\  | |/   |   \\      ");
        sendConsole("§b     |__|\\_/|__||_||_||_\\___/|_|  |_|_|\\__/ \\__/      ");
        sendConsole("§6");
        sendConsole("§4  EKLENTI LISANSI HATALI!");
        sendConsole("§6");
        sendConsole("§c  Musterimiz degilsin veya sozlesmelerimize uymadin");
        sendConsole("§c  bu yuzden senin cihazini otomatik olarak");
        sendConsole("§c  sistemimizden devre disi biraktik.");
        sendConsole("§6");
        sendConsole("§f  Urunu kullanmadan once okuyun;");
        sendConsole("§e  https://www.minenix.com/terms/sale");
        sendConsole("");
        sendConsole("§f  Bu konuda itiraz etmek isterseniz,");
        sendConsole("§c  https://www.minenix.com/support §fkismindan bize");
        sendConsole("§f  destek talebi gonderebilirsiniz.");
        sendConsole("");
    }
}
Then call it in onEnable(): LicenseChecker.run();

​
License API (Skript)

You can check the license using the Minecraft skript plugin. The skript-reflect plugin is required. 
options:
  TOKEN: TOKEN RECEIVED FROM THE SITE
  PRODUCT_ID: 10
  HTTP_TIMEOUT_MS: 8000

import:
  java.net.URL
  java.net.HttpURLConnection
  java.net.URLEncoder
  java.io.InputStreamReader
  java.io.BufferedReader

function urlenc(t: text) :: text:
  set {_enc} to URLEncoder:encode({_t}, "UTF-8")
  return {_enc}

function jhttp_get(u: text) :: text:
  set {_url} to new URL({_u})
  set {_conn} to {_url}.openConnection()
  {_conn}.setRequestMethod("GET")
  {_conn}.setConnectTimeout({@HTTP_TIMEOUT_MS})
  {_conn}.setReadTimeout({@HTTP_TIMEOUT_MS})
  {_conn}.setRequestProperty("User-Agent", "Zonely-License-Checker/1.0")

  set {_code} to {_conn}.getResponseCode()
  if {_code} = 200:
    set {_isr} to new InputStreamReader({_conn}.getInputStream())
  else:
    set {_es} to {_conn}.getErrorStream()
    if {_es} is not null:
      set {_isr} to new InputStreamReader({_es})
    else:
      set {_isr} to new InputStreamReader({_conn}.getInputStream())

  set {_br} to new BufferedReader({_isr})
  set {_sb::*} to ""
  while true:
    set {_line} to {_br}.readLine()
    if {_line} is null:
      break
    add {_line} to {_sb::*}
  {_br}.close()
  {_conn}.disconnect()

  set {_body} to join {_sb::*} with ""
  return {_body}

function discover_ip() :: text:
  set {_sources::*} to "http://checkip.amazonaws.com", "https://api.ipify.org", "https://ifconfig.me/ip"
  loop {_sources::*}:
    set {_b} to jhttp_get(loop-value)
    if {_b} is set:
      set {_ip} to trim({_b})
      if {_ip} matches regex "\\d+\\.\\d+\\.\\d+\\.\\d+" or "%{_ip}%" contains ":":
        return {_ip}
  return ""

function banner_ok():
  send "&6" to console
  send "&6      __     __               _    _    __   __       " to console
  send "&e     |  \   /  | _           | \  | |_ /  \ /  \      " to console
  send "&4     | + \_/ + |(_) ____ ___ |  \ | (_)\\  _|_  /      " to console
  send "&9     |  \   /  || || __ / -_|| | \  | |/   |   \      " to console
  send "&b     |__|\_/|__||_||_||_\___/|_|  |_|_|\__/ \__/      " to console
  send "&6" to console
  send "&a  EKLENTI LISANSI DOGRULANDI!" to console
  send "&6" to console
  send "&f  Urun, &alisans &fsunucularimiz tarafindan" to console
  send "&f  basariyla dogrulandi. Urun kullanimina hazirdir." to console
  send "&f  Eger bir urunde sorun oldugunu dusunuyorsaniz" to console
  send "&6  https://www.minenix.com/support &fkismindan bize" to console
  send "&f  destek talebi gonderebilirsiniz." to console
  send "&6" to console
  send "&f  Urunu kullanmadan once okuyun;" to console
  send "&e  https://www.minenix.com/terms/sale" to console
  send "" to console
  send "&b  wCore vX.Y.Z &feklentisini kullandiginiz" to console
  send "&f  icin ve bizi desteklediginiz tesekkurler!" to console
  send "" to console

function banner_fail():
  send "&6" to console
  send "&6      __     __               _    _    __   __       " to console
  send "&e     |  \   /  | _           | \  | |_ /  \ /  \      " to console
  send "&4     | + \_/ + |(_) ____ ___ |  \ | (_)\\  _|_  /      " to console
  send "&9     |  \   /  || || __ / -_|| | \  | |/   |   \      " to console
  send "&b     |__|\_/|__||_||_||_\___/|_|  |_|_|\__/ \__/      " to console
  send "&6" to console
  send "&4  EKLENTI LISANSI HATALI!" to console
  send "&6" to console
  send "&c  Musterimiz degilsin veya sozlesmelerimize uymadin" to console
  send "&c  bu yuzden senin cihazini otomatik olarak" to console
  send "&c  sistemimizden devre disi biraktik." to console
  send "&6" to console
  send "&f  Urunu kullanmadan once okuyun;" to console
  send "&e  https://www.minenix.com/terms/sale" to console
  send "" to console
  send "&f  Bu konuda itiraz etmek isterseniz," to console
  send "&c  https://www.minenix.com/support &fkismindan bize" to console
  send "&f  destek talebi gonderebilirsiniz." to console
  send "" to console

on load:
  send "&6[LISANS KONTROLCUSU] &fEklenti lisansi kontrol ediliyor." to console

  set {_ip} to discover_ip()
  if {_ip} is "":
    send "&cDis IP tespit edilemedi. Lisans dogrulamasi atlandi." to console
    stop

  set {_url} to "https://www.minenix.com/api/license/%{urlenc(@TOKEN)}%/%{urlenc(@PRODUCT_ID)}%/%{urlenc({_ip})}%"
  set {_resp} to jhttp_get({_url})

  if {_resp} is set and "%{_resp}%" contains "true":
    banner_ok()
  else:
    banner_fail()
    send "&c[ZONELY] Sunucu kapatiliyor (lisans hatali)..." to console
    execute console command "stop"
Congratulations! You can now use the license API in your products.

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Java Encryption

Code obfuscation allows you to make it difficult for users to directly access methods and constants (e.g., tokens, endpoint paths) in the license verification flow. This significantly hinders reverse engineering attempts. Recommended tool (open source): Java Obfuscator 1.9.3
Load the jar in the GUI and start encryption. It’s that simple!

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Script Encryption

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1.7 – 1.21+:

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1. Wenta Script Obfuscator (Python-based)

  • Compatibility: 1.7 – 1.21+
  • Features:
  • Obfuscates variable and function names
  • Can encode strings with Base64
  • Adds random junk code
  • Obfuscation levels (1–5)
  • Requires: Python 3.6+
Link: SpigotMC – Script Obfuscator (Wenta)
**Congratulations! **You have now secured your products.