This add-on is built to work with the AD Credits add-on. It allows you to purchase products with credits. Built for the AD Credits add-on, Credits: Shop integrates with PayPal and supports multiple currencies and everything else the core supports.
After you've got it installed and working, you might want to check out some of the amazing features that come with this product. Click any of the links below to jump to that section. Here are some of the main features, and if you get stuck on anything else, feel free to create a ticket.