You are able to view any courses you have purchased and all sites that you have joined through your Account.
Viewing Registered Sites
You can view a list of sites that you are registered into. To do so, go to your Account Settings page, then click on the Membership tab. This page displays the status of your membership in the sites you're registered into.
Going to the Order History page lets you view purchase details on the sites you've joined.
Receipts for Courses Purchased
Go to your Account Settings page, then click on the Courses Purchased tab. This page will list out all courses you have purchased. Please note that if the course is offered as free, it will not appear here.
Clicking on an Order Number will show you details on that order, namely the courses you purchased as part of that transaction.
If you click on the "Click to open a window with a printable invoice" link you will then see an itemized receipt that you can print.