We should redirect back to the course page after the user registers. I don't think a success message is necessary though, as the "Start Taking this Course" button will be visible to enable the user to enrol in the course.

Hey Donna and Dan! In the PR description I explain what my findings were regarding this issue... Please let me know your thoughts on this approach, if you'd like me to try a different one (in case I was wrong or you'd prefer something else), or if there's anything else I can do to help!

Oh, and btw Donna, when executing the code sniffer (with the standards that came with the plugin) I realized that there are some warnings and errors regarding comment styling, naming conventions, deprecated parameters, etc... I'm not sure if they're being ignored on purpose, or that you have a thousand more critical things on your table!... In case it's the latter, would you like me to spend some time fixing all of those; or adding the phpcs ignore comment in case the "error" should be ignored? Would that be helpful? (And I wasn't sure if this is the right place to ask this so I'm sorry if it isn't!)