Initially proposed service endpoint types
1 - No service endpoint, for example, did:key, a method whose DIDs take no endpoints.
2 - A Mediator endpoint is identical across numerous DIDs and DID documents in order to promote herd privacy. For example, the Aries community has a definition.
3 - A Notification endpoint enables routing but does not imply long term storage. Note: notification includes acknowledgements and errors, not necessarily bidirectional or human-readable messaging.
4 - An Authorization endpoint refers to a policy decision point which mediates an access request relative to the policies of a DID controller.
5 - A Resource endpoint refers to a policy enforcement point for storage secured on behalf of the DID controller or subject.