Graph API & Real-Time updates

Question

My need is to have facebook poll my server using POST requests whenever a user that has "allowed / installed" my application changes something, eg, their checkins.

I have followed the page at http://developers.facebook.com/docs/api/realtime very thoroughly and have successfully set up the subscription.

When I place a get request the subscriptions graph I get the below response.

{
"data": [
  {
     "object": "user",
     "callback_url": "http://www.HIDDEN.com/FORSECURITY/callback.php",
     "fields": [
        "checkins",
        "feed"
     ],
     "active": true
  }
   ]
}

Which tells me that the subscription is set up, and that when a user that has authenticated my app, changes their feed / checkins, that a POST request should be sent to the callback_url.

The problem is, it does not. I have Googled, troubleshooted, Googled some more, redid everything and I just can't seem to find the answer.

I have tested my callback.php file by posting to it, and it captured all the data, I just capture everything in $_POST to make sure if there is anything that I will capture it.

I've also added if statements to just write to a file if the file is accessed and !empty($_POST)

I tried checking in, making wall posts everything. It just does not poll the callback php.

Does anyone have an Idea about this?

Thanks. Mandus

UPDATE

It seems like after 60 minutes, it started working. So it probably takes a while for everything to get activated.