Setting up Auth0 account - ob1dev/Auth0 GitHub Wiki
Before you start you need Auth0 account. If you don't have one, go to https://auth0.com/signup and sign up. There is a Free pricing plan.
Moreover, you can participate in the Open Source Program (if you qualified) and get all the features for free.
What is Auth0?
Auth0 is an Identity-as-a-Service (IDaaS) provider. Auth0 provides customers with a Universal Identity Platform for their web, mobile, IoT, and internal applications.
Summary
Now when you have the account you can start delegating complex identity use cases with an extensible to Auth0.