How to license or protect the backand server from hacking?

Question

Java

There is a project on microservices that will need to be launched on servers on clients. The authorities demand to make protection that would block some functions in the absence of a license. That is, approximately like the ultimate version of Intellej Idea. The problem is that Idea is a desktop, and I need to somehow protect a set of microservices.
In what way can this be done? Perhaps there are already some ready-made solutions

Answer 1

From a licensing point of view, what difference does it make where the application is running, on the desktop or on the server?
Do exactly the same as Jetbrains:
1. Activation server on your side: let your microservices go and check what is there with the license.
1.1. An activation server deployed on the client side, but which still goes to you.
2. Key: some kind of encrypted file with information about the license.
ps: a competent lawyer will protect the best.