To make your store look consistent, and deal with difficult tax situations consistently, it seems best to work with products.
I have a book product, and a class product. I plan to have a bundled book+class product.
When someone buys the class product, or the book+class product, I would like Wix to send them an automatic invite to the Online Program associated with the class product. I currently have to do this step manually.
Fixing this is likely easiest done with an automation. Wix would need to add a new action: Invite to Online Program. The trigger would be buying the class or book+class product, the action would be inviting the person to the online program.