Automation Studio is an add-on. It’s built on the Workato integration platform and has out-of-the-box connectors for Epicor, Shopify, and many other systems. You can essentially use the platform to build relatively simple integration “recipes” that transfer data between systems.
It is purchased by the number of authenticated connections that you need (sounds like you’d need at least one for Epicor and one for Shopify, in your use case) but I believe that you need to be on Kinetic 2022 for it to be available; it was just announced and released at Insights last year.