how do u use loadbalancing in photon server?

Hi, I'm a absolute beginner to photon server, not photon cloud. But I want to make the simple multiplayer game by using the LoadBalancing application in photon server. Unfortunately, there are many questions such as User authentication from the first time.
First, I know that photon v4 supports user authentication now. is this true? if so, i want to know about this in detail.
Second, i think that load balancing code structure is very complex. if i insert the game logic into that, where do i insert the game logic into?
I hope ur great and detail help. thank u.

Answers