how to make a save system for oculus quest?

I want to make a save system for my oculus game, the currency is bananas and I’m thinking about using player-pefs but I don’t really know how to use it and also not sure if it will work for multtiplayer, or if I should somehow get the oculus username and attach the variable to that? any help would be appreciated, for now I’m going to work on other things in the game

by the way I have the oculus sdk and opener and everything setup ok