Securing AWS HTTP APIs with JWT Authorizers

Hi, I am new to Auth0.
I created an application inside a tenant that uses a Database Connection and I got the SPA example to with the sdk to login/logout just fine.
My next task was to integrate the login so I can secure my API gateway on AWS. I read this article and got it to work using the Custom API just as you described in this article. However, I don’t know how I can use my SPA auth to object the necessary token from the custom api to call my AWS gateway.
I am missing something here. Appreciate any help and direction you can give me.

Thanks