Photon PUN and persistence

Hi, what would be good ways to include login and account functionality in my game which is using Photon PUN. I want allow people to register and account, login with it, and keep their user data. I know PUN doesn't offer that, but how else can I do it. Would Photon Server work? I have a virtual private server that I could use to store a database.

Would anyone be able to give me any suggestions? Thank you.