title: Custom Payload is not working for Messenger
body: <p>I am trying to add suggestion chips in dialog flow to be used in Facebook Messenger. But it is not Working which i am unable to understand</p>
  
  <p>Here is my Custom Payload</p>
  
  <pre><code>{
    "facebook": {
      "attachment": {
        "type": "suggestion_chips",
          "title": "title",
        "suggestions": [  "chip 1" ," chip 2"]
      }
    }
  }
  </code></pre>
  
  <p>Thanks in Advance</p>