POST /tag/:tag/inbox
POSTs to the /tag/:tag/inbox must be signed using HTTP Signature.
The body must be an AS2 Activity, and the content type must be application/json, application/ld+json or application/activity+json.
The activity must have an actor, and that actor must have the same ID as the HTTP signing key.
Some activities will have side-effects.
Edited by Evan Prodromou