How to make auth0 api request in Post-User Registration hooks?

I want to create a Post-User registration hook that sends an email to certain users of the application. The first step I need is to retrieve the users from the /api/v2/users endpoint. I don’t currently see how to get and pass the authorization token to the /api/v2/users endpoint from inside the hooks endpoint. Is there something I need to configure to get an accessToken from inside the hook? Is the accessToken already passed in somewhere and I can retrieve it? Are there any examples of making auth0 api requests from inside a hook? Any help would be appreciated!