title: Google Calendar API Push notifications issue
body: <p>I am trying to implement push notifications feature in Google calendar api. I have also whitelisted my domain <a href="https://www.skygazr.com" rel="nofollow">https://www.skygazr.com</a> in webmaster tools and cloud console.</p>
  
  <p>Now while am trying to create a working copy of Watch request it is giving me a webhookUrlUnauthorized error.</p>
  
  <p>Please check the below request and response.</p>
  
  <pre><code>OST /calendar/v3/calendars/info%40bacnn.com/events/watch HTTP/1.1
  Host: www.googleapis.com
  Content-length: 111
  Content-type: application/json
  Authorization: Bearer ya29.1.AADtN_UTGxLw6gmqJTJIPX1VhOyuUckZw-yNjIPznP5Wefl0sxwnertq7ZEYP647CDOvQQ
  {
    "address": "https://www.skygazr.com/notifications",
    "id": "push-notif-bacnn-0123456789ab",
    "type": "web_hook"
  }
  HTTP/1.1 401 Unauthorized
  Content-length: 302
  X-xss-protection: 1; mode=block
  X-content-type-options: nosniff
  Expires: Wed, 11 Dec 2013 10:25:14 GMT
  Server: GSE
  Cache-control: private, max-age=0
  Date: Wed, 11 Dec 2013 10:25:14 GMT
  X-frame-options: SAMEORIGIN
  Content-type: application/json; charset=UTF-8
  Www-authenticate: Bearer realm="https://www.google.com/accounts/AuthSubRequest", error=invalid_token
  {
   "error": {
    "errors": [
     {
      "domain": "global",
      "reason": "push.webhookUrlUnauthorized",
      "message": "Unauthorized WebHook callback channel: https://www.skygazr.com/notifications"
     }
    ],
    "code": 401,
    "message": "Unauthorized WebHook callback channel: https://www.skygazr.com/notifications"
   }
  }
  </code></pre>
  
  <p>I sincerely appreciate your help if someone can help me out here. I tried several methods and always its resulting the same issue. FYI I am checking request and response from <code>https://developers.google.com/oauthplayground</code></p>
  
  <p>Regards,
  Dinesh</p>