I have two websites, one is under userFrosting (UF) framework, the other is Rocket.chat (RC). Each has its own user authentication system. I want to authenticate both under same system. I know i can either use Google to auth both, or LDAP if i want to have my own system. Let me know if there is other way to do this?

If I were to use LDAP, does that mean i have to completely abandon UF and RC's user database and use LDAP's database instead? If so, does that mean whenever I need to create new form in UF, I need to write codes to interact with LDAP's database rather than UF's?