From what I learned so far the FedEx require each customer to sign up for FedEx Web Services which is very developer specific and not quite obvious for certain customers.
I'm curious if there is a better way to connect FedEx services with a hypothetical SaaS product?
You need to become a FedEx Certified Developer. It's a very time-consuming process. When you request web service credentials they ask very specific questions about inside/outside development. Based on these questions you should be able to get in contact with the proper department.
