I am trying to create functionality to log in users from a third party database using generateSessionToken()
According to the docs: generateSessionToken - Velo API Reference - Wix.com
If a user does not exist in the wix members database a new user will be created with a random password.
Are these users permanent? Or are they removed from the database after logging out? If they are permanent then how is their password verified next time they log in? Or is the password not even used?