STU Publication of HL7 FHIR® Implementation Guide: FAST UDAP Security for Scalable Registration, Authentication, and Authorization, Edition 2 – US Realm
Learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=606 or see the specification at
http://hl7.org/fhir/us/udap-security/STU2