What is the best way to use authentication in conjunction with RateLimit in Ktor?

I wanted to support three types of requests in my application:

What is the best way to use authentication in conjunction with RateLimit in Ktor?

I wanted to support three types of requests in my application:

Ktor, serialization in StatusPages not working

Here is code from Auth guard:

How to start the Ktor Server when the application get launch

In my project I have a module(ktor server project).
I need to start the server when app launch. What I tried and my codes are below.