Hello,

Thank you for your interest.

The fact is that our plugins just allow to set a price for the actions provided by a plugin. For example, the Photo plugin provides the Add Photo action and our plugin gives the ability to the site admin to set the price for this action. 

If you want users receive/lose credits for sharing the content or inviting friends - you should contact the developers of these plugins and ask them to make their plugins work with the User Roles functionality (core feature).