title: Facebook Messanger get access token for messenger app
body: <p>Trying to create a Facebook messenger app based on <a href="https://github.com/fbsamples/messenger-platform-samples" rel="nofollow noreferrer">this sample</a> and three values needed are:</p>
  
  <ul>
  <li>app secret</li>
  <li>page access token</li>
  <li>validation token</li>
  </ul>
  
  <p>When I look up Facebook validation token I'm seeing references <a href="https://stackoverflow.com/a/5091913/773263">like this</a> one which say it is generated between your app and user name. </p>
  
  <p>But according to the <a href="https://github.com/fbsamples/messenger-platform-samples/blob/master/node/app.js" rel="nofollow noreferrer">code comments</a> it is just an arbitrary value:</p>
  
  <pre><code>// Arbitrary value used to validate a webhook
  </code></pre>
  
  <p>Am I right to assume that this validation token is completely unrelated to the validation token described in the Javascript SDK documentation?</p>