Design

@INVALID-REGION-CODE I've never thought about the Universal API doing a callback back INTO the Requester, but that's a very valuable thing to note. Here I was thinking it was always an entity submitting a request to the Universal API and receiving back a reply - and you've just indicated that we need to support the ability to be `pinged`, `scanned`, `probed`, `inspired`, etc. from the API itself. Fascinating.