https://orchestrateserver.caresource.careevolution.com/api/fhir/r4recordsR4 – read/write (separate Patients per record), documented here, try it here
https://orchestrateserver.caresource.careevolution.com/api/fhir/r4R4 – read-only, documented here, try it here
https://orchestrateserver.caresource.careevolution.com/api/fhir/provider-directoryR4 – read-only, documented here, try it here