Using Aws cognito for server side rendering application

I have never used aws cognito in any application, but I will be using soon. Currently I am using pow for handling authentication stuff in the web application. The documentation that I read so far for aws cognito describe tokens that we get from aws after successfully authenticating the user, but I couldn’t figure out how to use those tokens in the forms for authenticating the user, and managing their access.
I didn’t find much stuff on this topic either.
I am just looking for the flow how to do that?
What kind of plugs I need to add in the browser pipeline?
Where to store the tokens after user signed in?
How to pass them around?
Any thoughts or experience you could share would be much appreciated.
Thank you.