put https://fhir-api.zapehr.com/r4b/DocumentReference/
DocumentReference on the FHIR specification website.
A reference to a document of any kind for any purpose. Provides metadata about the document so that the document can be discovered and managed. The scope of a document is any seralized object with a mime-type, so includes formal patient centric documents (CDA), cliical notes, scanned paper, and non-patient specific documents like policy text.
The body should be a valid FHIR object for DocumentReference.
For example, if updating a Slot resource, here is a valid object:
{
"resourceType": "Slot",
"schedule": {
"reference": "schedule/a"
},
"status": "free",
"start": "2022-08-10T11:00:00Z",
"end": "2022-08-10T12:00:00Z"
}
You can reference the FHIR documentation to determine the format for DocumentReference.