A big use-case for this endpoint is being able to now have you application discover more restrictive scopes, for instance `read:me` instead of requesting `read:accounts` (read:me is new in 4.3)
There is one non-standard property which is app_registration_endpoint, instead of registration_endpoint, as our existing application registration endpoint isn't compatible with OAuth 2.0 Dynamic Client Registration. (that's the * in the previous post)