How to create a centralized auth token management for 2 webflow projects but 1 auth token

What's the best way to manage an auth token when the user can access 2 webflow websites?

If the user logs out of one website, I want them to be logged out completely of both websites as it's the same auth.

However, Xano lets users keep creating different auth tokens. What's the standard practice with this?

Basically, I want to invalidate the auth token once a user logs out of one of the websites. How best do I do this?

Thanks

Edit: FYI my tech stack is Webflow, Wized, Xano