Can I have custom server logic with PUN?

Hi, I've been using PUN to send RPC messages between the clients that are interpreted by the clients. Now I want to add game logic that runs on the server-side. The point is to implement game-logic completely on the server side.

Is this possible with PUN? I don't want to enter the hassle of installing and managing photon server instances by myself. In that case, how and where would I uplaod the server-side game code?

I've been looking at the documentation but didn't find it.

Cheers.