Great article and project!, implementation of this solution is super fast and took me almost no time.
However, I have a question (more to Auth0 and Vercel alone). is it possible to determine using a deployment on Vercel:
http: //localhost: 3000/api/auth/callback to some dynamic address so that the solution can be tested on randomly generated previews urls?
(e.g., http: //project-name-/**/.now.sh/api/auth/callback)