https://github.com/edx/edx-platform/wiki/Shopping-Cart
Diana gave a talk at the conference about using the shopping cart feature and you can see her slides here:
https://docs.google.com/presentation/d/1APBS6i8EACfRUMBgs_BakmTnAqvHGV4bbY6vH8QD-1s/edit?usp=sharing
And youtube video talk here:
https://www.youtube.com/watch?v=-4ge5t2DFyc
Right now, it appears that there’s only support for Cybersource (which the customer is okay with), but we may want to consider adding support for Stripe as part of the Appsembler Open edX offering.
Also, check out this pull request that Stanford made for paid course registration: