Ask HN: My client is about to franchise to 50+ locations across US

I have a client that owns 3 fitness studios. I've built out a .NET web application for them that allows users to book classes, buy packages, manage their accounts, etc. The client has been approached by an investment group to adopt a franchise model to scale across the US to over 50 locations next year.

What are questions that I should prepare for the investment group either of a technical or business nature? What should I keep in mind when switching to a franchise model and to scaling to such a large size from a technical perspective?

This is my first time dealing with something like this and would love your feedback.