public function subscribe()
 {
     $eventId = Utils::lookupEventId(trim(Input::get('event')));
     if (!$eventId) {
         return Response::json('', 500);
     }
     $subscription = Subscription::where('account_id', '=', Auth::user()->account_id)->where('event_id', '=', $eventId)->first();
     if (!$subscription) {
         $subscription = new Subscription();
         $subscription->account_id = Auth::user()->account_id;
         $subscription->event_id = $eventId;
     }
     $subscription->target_url = trim(Input::get('target_url'));
     $subscription->save();
     return Response::json('{"id":' . $subscription->id . '}', 201);
 }
 public function getSubscription($eventId)
 {
     return Subscription::where('account_id', '=', $this->id)->where('event_id', '=', $eventId)->first();
 }