title: php facebook payment subscription
body: <p>I am trying to implement facebook payment subscription for my app.</p>
  
  <p>I need some help with verifying if userX is subscribed, each time he accesses the application's main page.</p>
  
  <p>Is there a way to call the facebook API using PHP with the PRODUCTID (ID of the selected subscription method), APPID, USERID and then have facebook API return the subscription status?</p>
  
  <p>Thank you</p>