Alexa account linking with Auth0


I’m building a vuejs SPA with an express js backend API protected by Auth0. Now I need to build an Alexa skill that accesses my protected API.
How can I configure the Alexa account linking with Auth0? I have searched online for hours to find a good recent solution, but I found old or incomplete articles.
Alexa portal changed in the last year. Is there an official guide with the latest updates?

Thank you.