jDownloads allow download access on the basis of Joomla User Group. PayPlans is integrated with jDownloads using Joomla User Type App. This app assign the Joomla user group to user on the basis of user's subscription status. So, PayPlans is natively integrated with jDownlaods.
NOTE : PayPlans can be integrated with latest version of JDownloads-3.2v using Joomla User Type App.