Will the steam subsystem work without installing the game on steam?

I am making a game but ı am not publish in steam.
Can I use the online system without using steam?

Hey @Beymen_tr! Welcome to the forums!

I am sorry to say, no, as far as I’m aware, you can’t use the Steam subsystem without publishing through Steam, as you will need an application ID to utilize it. See below for more details!