def deliver
      return self if @_push_was_called

      @_push_was_called = true

      apn = APNCertificate.instance
      @_notifications.each do |notification|
        apn.push(notification)
      end
    end
def deliver
      return self if @_push_was_called

      @_push_was_called = true

      apn = APNCertificate.instance
      @_notifications.each do |notification|
        apn.push(notification)
      end
    end
Send out the push notifications