Although we use our custom implementation for the world cup application, we have prepared a simple example to show you how to use Auth0 with Aurelia. You can download the code from https://github.com/EriksonMurrugarra/AureliaAuth0.
Auth0 implements JWT; this should ring a bell for you, because we have implemented our custom Auth0 implementation using JWT. Let's start by creating a free account on Auth0.