Add customer to one or more different Joomla user groups after he successfully paid for the order. The app will be very helpful when you wanted to give specific items that are accessible to specific items (like articles or access to an extension, a gallery or a third party download manager)

A real time example: Paid content. Customers can access the content only after making the payment as the content will be accessible only to a specific user groups.

You can do quite a lot of things using the Joomla ACL, J2Store and the App.