For anyone would like to better understand ServiceStack's Authentication more, the Auth docs are being rewritten which now includes new Auth Diagrams that help visualize the flow and how Authentication works:
Integrated ASP.NET Core Authentication
Here are the 3 new project templates which enables ServiceStack to use the same Authentication as the
rest of your ASP.NET Core and MVC Application in 3 different popular scenarios:
Whilst the World Validation walk through shows how to Authenticate, Register Users and access Authenticated Services in 8 different popular Web development scenarios.