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Auth0 Implementation for Multiple Sites

Hi.

I am creating 2 websites, each have their own user database.
What I’m trying to do is allow registered users on Site A to able to login to Site B without manually
registering them to it.

So far what I have done:
*Site A user logs in. User exist in Site A userDB, save to Auth0 DB.

What I’m trying to solve is:
*Site A user logs in to Site B. Site A user does not exist in Site B userDB but exist in my Auth0 DB, save Site A user details to Site B userDB.

I was thinking of making an xref table. Will contain User Id (from site) and user_id (from auth0), then will call an api from Site A to retrieve the user details there and save it to Site B userDB or vice versa.
The problem here is I have columns with foreign keys in user table that might not exist on the other site DB. Also, user in Site A may have different permission sets that exists in both sides.

Any advice/idea best way to implement this?

Hey there!

Sorry for such huge delay in response! We’re doing our best in providing you with best developer support experience out there, but sometimes our bandwidth is not enough comparing to the number of incoming questions.

Wanted to reach out to know if you still require further assistance?