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Amol/WhatsappChatbot/WhatsAppChatbotServlet.java

+package com.bot;
+
+import java.io.*;
+import javax.servlet.*;
+import javax.servlet.http.*;
+import org.json.JSONObject;
+
+public class WhatsAppChatbotServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+    private static final String VERIFY_TOKEN = "mySecretVerifyToken123";
+    private static final String ACCESS_TOKEN = "EAFYJZCF8GyacBOZBlxVNRwqZBNA4BJVYYCH9gKRk0fjdG1XaONKXQnDIqldZB8mvpNVpILnCuOsHyv81CBKa3pG9G6pRsEAxTI4FAUdFEBhlmsV22YdBs5svyKmFe4bcsuirk8wvPoTHTXTsCvqDZBLTwgmDSz9NZC9rfUBxSVTM37zZCcHZBZAm69duKjUxO56ZBAeOr4KdBUyJxUHx965TeBYSoKULRcTLXH3HcZD"; // Your full token
+    private static final String PHONE_NUMBER_ID = "647550301772780";
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String mode = request.getParameter("hub.mode");
+        String token = request.getParameter("hub.verify_token");
+        String challenge = request.getParameter("hub.challenge");
+
+        if ("subscribe".equals(mode) && VERIFY_TOKEN.equals(token)) {
+            response.getWriter().print(challenge);
+        } else {
+            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+        }
+    }
+
+    
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        BufferedReader reader = request.getReader();
+        StringBuilder payload = new StringBuilder();
+        String line;
+        while ((line = reader.readLine()) != null) {
+            payload.append(line);
+        }
+
+        JSONObject body = new JSONObject(payload.toString());
+        System.out.println("Incoming webhook:\n" + body.toString(2));
+
+        try {
+            String from = body.getJSONArray("entry")
+                .getJSONObject(0)
+                .getJSONArray("changes")
+                .getJSONObject(0)
+                .getJSONObject("value")
+                .getJSONArray("messages")
+                .getJSONObject(0)
+                .getString("from");
+
+            String message = body.getJSONArray("entry")
+                .getJSONObject(0)
+                .getJSONArray("changes")
+                .getJSONObject(0)
+                .getJSONObject("value")
+                .getJSONArray("messages")
+                .getJSONObject(0)
+                .getJSONObject("text")
+                .getString("body");
+
+            // 👇 Using MessageSender class now
+            if (message.equalsIgnoreCase("hi")) {
+                MessageSender.sendTextMessage(from, "Hello! How can I help you today?");
+            } else if (message.equalsIgnoreCase("help")) {
+                MessageSender.sendTextMessage(from, "You can ask me about our services, timings, or support.");
+            } else {
+                MessageSender.sendTextMessage(from, "Sorry, I didn't understand that. Type 'help' for options.");
+            }
+
+        } catch (Exception e) {
+            System.out.println("No message to process or format error: " + e.getMessage());
+        }
+
+        response.setStatus(200);
+    }
+}