The best resource to master payment systems

I’m writing to express my gratitude for the Payments Fundamentals course, which is the best resource to master a conceptual understanding of payment systems. I have purchased access and I particularly liked the section about the explanation regarding differences between Clearing and Settlement as it blurs often and in some CSMs it is hard to distinguish what is a clearing and a settlement. I think payment companies could use Paymerix’s course for new employees or a refresher for existing employees.