Hi @Ali Chaib !

1. Yes, it can work with POST, GET and PUT out of the box.

2. The data is stored in IRIS database, in global arrays - as any data other stored via InterSystems data products.

3. FHIR server exposes standard FHIR R4 REST API which you can access via HTTP requests.

4. These classes help with development Digital Health Interoperability scenarios, e.g. if you have to establish perpetual processes to read from FHIR server and/or transform the data into other formats (e.g. HL7) and/or send it into different consuming applications.

5. This can be implemented via Digital Health interoperability framework. See the example.

I request @Patrick Jamieson and @Daniel Franco to provide more information.