The codes identify the conditions under which accept acknowledgements are required to be returned in response to this message. Note that accept acknowledgement address two different issues at the same time: reliable transport as well as syntactical correctness
API
Project FHIR API
This is the location where you can find your resource using a FHIR client.
Simplifier FHIR API
The global endpoint is where users can search for all resources in Simplifier. Resources have a globally unique guid Id here.