This is a "classic" topic also discussed during Infotainment systems de=
finition.
Aspects
Representing user identity within the vehicle
The person's role (driver, passenger, owner, valet/concierge, car-renta=
l)
Method of identification (login/password, biometrics, ... etc.)
Method of tying the internal user representation in vehicle to (multipl=
e) "identities" externally. This means virtual identities and account=
s. (Email account, Social Media, etc. for the purpose of providing th=
e user with interaction with those accounts)
Using external accounts with Single-Sign-On / OAUTH
User management (including purge accounts/data when vehicle ownership i=
s transferred, or for car-pool/rental use cases)