diff --git a/README.md b/README.md
index 690ea91..7b9e07e 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,8 @@ Most of these steps are described in more detail in the [tutorial][],
     ```js
     module.exports = {
         appId: '27ed9330-6710-4983-9380-9f0748ca6b41',
-        appSecret: '0ef85922-849a-4397-9564-94247f95dd7c'
+        appSecret: '0ef85922-849a-4397-9564-94247f95dd7c',
+        baseUrl: 'https://x-x-x-x.ngrok.io'
     };
 
     ```
diff --git a/index.js b/index.js
index 43e2b0b..e74b5ac 100644
--- a/index.js
+++ b/index.js
@@ -3,9 +3,11 @@ var config = require('./config.js');
 var express = require('express');
 var fs = require('fs');
 
-flock.setAppId(config.appId);
-flock.setAppSecret(config.appSecret);
 
+// Prefill all the configurations in the flock node_module index.js
+flock.appId = config.appId;
+flock.appSecret = config.appSecret;
+flock.baseUrl = config.baseUrl;
 var app = express();
 
 // Listen for events on /events, and verify event tokens using the token verifier.
@@ -21,13 +23,15 @@ try {
 }
 
 // save tokens on app.install
-flock.events.on('app.install', function (event) {
+flock.events.on('app.install', function (event, callback) {
     tokens[event.userId] = event.token;
+    callback(null, {});
 });
 
 // delete tokens on app.uninstall
-flock.events.on('app.uninstall', function (event) {
+flock.events.on('app.uninstall', function (event, callback) {
     delete tokens[event.userId];
+    callback(null, {});
 });
 
 // Start the listener after reading the port from config