Secure flow to let user delete their own account

Coming from Firebase, my understanding of the secure way to let the user delete their own account is by forcing them to reauthenticate right before doing so. However, it looks like authentication through Auth0 goes through the universal auth, but deleting a user goes through my own server. I’m struggling to figure out how to connect those two. Is reauthenticating the user even necessary through Auth0? What is the proper flow to let the user delete their own account?