If a url parameter is passed, being able to ingest it into the app (for example through a sign in/signup, or what I am really hoping to build is a two step verification for email validation, as well as create a dynamic passwordless auth 'magic login' by setting a string field on user as a token then on the my login page have a username input, an action to set the magic token, then send the link to a separate login/auth screen including the magic token, and user identifier as url parameters to the user, then an sometimes action on that screen that performs a user login when the magic token param to the magic token stored value where the the user identifier of the user in the users collection is equal to the user identifier url parameter.