diff --git a/app.js b/app.js
index 7f30a56..415114e 100644
--- a/app.js
+++ b/app.js
@@ -5,6 +5,13 @@ app.use(express.urlencoded({ extended: true }));
 
 const port = 3000;
 
+const myArgs = process.argv.slice(2);
+
+app.all('/validate', function (req, res) {
+   console.log("-------------- Validate Request --------------");
+   res.json( {"confirmation_code":myArgs[0]} );
+})
+
 app.all('/*', function (req, res) {
    console.log("-------------- New Request --------------");
    console.log("Headers:"+ JSON.stringify(req.headers, null, 3));
diff --git a/appTwitter.js b/appTwitter.js
new file mode 100644
index 0000000..4a3666e
--- /dev/null
+++ b/appTwitter.js
@@ -0,0 +1,42 @@
+var express = require('express');
+crypto = require('crypto')
+
+var app = express();
+app.use(express.json());
+const port = 3000;
+const consumer_secret = "Twitter API Key Secret";
+
+get_challenge_response = function(crc_token, consumer_secret) {
+  hmac = crypto.createHmac('sha256', consumer_secret).update(crc_token).digest('base64')
+  return hmac
+}
+
+app.post('/*', function (req, res) {
+  console.log("-------------- New Request POST --------------");
+  console.log("Headers:"+ JSON.stringify(req.headers, null, 3));
+  console.log("Body:"+ JSON.stringify(req.body, null, 3));
+  res.json({ message: "Thank you for the message" });
+})
+
+// Add support for GET requests to Twitter webhook
+app.get("/*", (req, res) => {
+  // Parse the query param
+  var crc_token = req.query["crc_token"];
+  console.log("-------------- New Request GET --------------");
+  console.log("Headers:"+ JSON.stringify(req.headers, null, 3));
+  console.log("Body:"+ JSON.stringify(req.body, null, 3));
+  // Check if a token is in the query string of the request
+  if (crc_token) {
+    var hash = get_challenge_response(crc_token, consumer_secret)
+    console.log("crc token hash="+ hash);
+    res.status(200);
+    res.send({response_token: 'sha256=' + hash})
+  } else {
+    res.status(400);
+    res.send({ message: "Error: crc_token missing from request."})
+  }
+});
+
+app.listen(port, function () {
+   console.log(`Example Twitter app listening at ${port}`)
+})
\ No newline at end of file
diff --git a/package.json b/package.json
index c2c41fc..dbc3989 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
     "start": "node app.js",
     "startSlack": "node appSlack.js",
     "startFacebook": "node appFB.js",
-    "startDropbox": "node appDropbox.js"
+    "startDropbox": "node appDropbox.js",
+    "startTwitter": "node appTwitter.js"
   },
   "repository": {
     "type": "git",
diff --git a/testhmac.js b/testhmac.js
new file mode 100644
index 0000000..1f22be0
--- /dev/null
+++ b/testhmac.js
@@ -0,0 +1,16 @@
+const crypto = require('crypto');
+
+const verifySignature = function(secret, payload){
+    const hash = crypto
+      .createHmac('sha256', secret)
+      .update(payload)
+      .digest('base64');
+    return `sha256=${hash}`;
+  }
+  
+payload={"event_id":"01GJ0FH2Y3H1TYFF8EP9H2RHSG","event_type":"form_response","form_response":{"form_id":"uyifVtg4","token":"a5f3s9fabveqqec7o9l9sa5f3s9fitvt","landed_at":"2022-11-16T15:04:08Z","submitted_at":"2022-11-16T15:04:43Z","definition":{"id":"uyifVtg4","title":"My typeform","fields":[{"id":"HTE1PyMQrlQK","ref":"01GJ0DJYHF6NH3B6NH0YSP1DVF","type":"short_text","title":"Hello, what's your name?","properties":{}},{"id":"7EfljHzxs76Q","ref":"01GJ0DJYHSJ8HMEG2MQ1E819TN","type":"multiple_choice","title":"Nice to meet you, {{field:01GJ0DJYHF6NH3B6NH0YSP1DVF}}, how is your day going?","properties":{},"choices":[{"id":"rbTzd6XVsx8x","label":"Terrific!"},{"id":"tHnbelIABoFL","label":"Not so well..."}]}]},"answers":[{"type":"text","text":"Felippe","field":{"id":"HTE1PyMQrlQK","type":"short_text","ref":"01GJ0DJYHF6NH3B6NH0YSP1DVF"}},{"type":"choice","choice":{"label":"Terrific!"},"field":{"id":"7EfljHzxs76Q","type":"multiple_choice","ref":"01GJ0DJYHSJ8HMEG2MQ1E819TN"}}]}}
+  
+secret = "12345";
+hmac = verifySignature(secret, JSON.stringify(payload));
+console.log(hmac);
+  
\ No newline at end of file