QuestionnaireResponse resource is used to capture additional information, notes, record question/answers, etc. about the referral. This resource will be referrenced via ServiceRequest resource.
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.