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Amol/WhatsappChatbot/MessageSender.java

+package com.bot;
+
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class MessageSender {
+
+    private static final String ACCESS_TOKEN = "EAFYJZCF8GyacBOZBlxVNRwqZBNA4BJVYYCH9gKRk0fjdG1XaONKXQnDIqldZB8mvpNVpILnCuOsHyv81CBKa3pG9G6pRsEAxTI4FAUdFEBhlmsV22YdBs5svyKmFe4bcsuirk8wvPoTHTXTsCvqDZBLTwgmDSz9NZC9rfUBxSVTM37zZCcHZBZAm69duKjUxO56ZBAeOr4KdBUyJxUHx965TeBYSoKULRcTLXH3HcZD";
+    private static final String PHONE_NUMBER_ID = "647550301772780";
+
+    public static void sendTextMessage(String to, String messageBody) {
+        try {
+        	URL url = new URL("https://graph.facebook.com/v19.0/" + PHONE_NUMBER_ID + "/messages");
+            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+            conn.setRequestMethod("POST");
+            conn.setRequestProperty("Authorization", "Bearer " + ACCESS_TOKEN);
+            conn.setRequestProperty("Content-Type", "application/json");
+            conn.setDoOutput(true);
+
+            String json = String.format("{\n  \"messaging_product\": \"whatsapp\",\n  \"to\": \"%s\",\n  \"text\": { \"body\": \"%s\" }\n}", to, messageBody);
+
+            OutputStream os = conn.getOutputStream();
+            os.write(json.getBytes());
+            os.flush();
+            os.close();
+
+            int code = conn.getResponseCode();
+            System.out.println("Response Code: " + code);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}