We're using Stripe to run our marketplace where teachers can sell their language courses. It does MOST of what we want/need.

I've done numerous checkout/payment processing integrations over the years. Stripe is still pretty easy to use and full-featured compared to what I've used in the past. It does have its annoyances, shortcomings and API inconsistencies - but it's still better than the alternatives, in my view.

Support has been good when I needed more documentation on something. Their chatbot performs very poorly, however.