Getting user meta data in nodejs

I’m using koa-jwt to authenticate the user and that’s working fine but now I want to get the user’s metadata.
I already populated the user metadata and the app metadata with some json for my test user directly on Auth0 console. I followed some articles online that also suggested that I’d add a hook under client-credentials-exchange so I did that.
I am still confused about how I can get that user metadata, I started following this article but I’m not certain what my “domain” is supposed to be, I’m developing on my localhost and even if I can upload my code and establish a domain how will Auth0 know my domain and how would it attach an endpoint to it.
I also trying using the example in this page but I couldn’t get past the authentication and I’m not sure where can I add in the user token.

Please help, thanks.

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