question

After 2 days of browsing the community pages we can't find relevant information on a standard approach to implement a custom authoritative server (no CloudScript involved). So I'm hoping that if I describe my use-case someone can step in and fill in the blanks.

We are developing a Unity Game that requires an authoritative server written in C#. The features on our list for the server are:

1. One server should be able to handle 100 users (but not more, so need to limit joining the server).
2. Server will not be a headless Unity client.
3. Should run sensitive code to protect the game from hacks, any code modifying the save would run on the server, not just simple validations.
4. Communication between client and server is via protobuf and RPC's (this part is already implemented in a local server, custom implementation that is not using UNet).
5. No interaction between players is permitted between players other than some pvp between online vs offline player profiles.
6. Save is in binary format.
7. Its not important if server runs on windows or linux ... best supported approach is a priority.

Can you guide us to the right approach for using Playfab with the above feature set?

Thank you!