How do I use Membership 2 Pro REST API (add-on)

The Membership 2 Pro includes REST API add-on. When enabled it gives you an URL and API passkey.

However, calling out that URL directly returns this message in the browser:

{"code":"rest_no_route","message":"No route was found matching the URL and request method","data":{"status":404}}

There's, however, no explanation/information on how to pass the API passkey there,
no info on endpoints etc.

Can we get some additional explanation and simple examples from Second Line Support or developers, please?
A blog post on this would be great too :slight_smile: