CommunicationRequest on the FHIR specification website.

A request to convey information; e.g. the CDS system proposes that an alert be sent to a responsible provider, the CDS system proposes that the public health agency be notified about a reportable condition.

The body should be a valid FHIR object for CommunicationRequest.

Here is an example:

{
  "resourceType": "CommunicationRequest",
  "id": "example",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">To be filled out at a later time</div>"
  },
  "status": "active",
  "subject": {
    "reference": "Patient/example"
  },
  "encounter": {
    "reference": "Encounter/example"
  }
}

You can reference the FHIR documentation to determine the format for CommunicationRequest.