SupplyRequest on the FHIR specification website.

A record of a request for a medication, substance or device used in the healthcare setting.

The body should be a list of valid JSON patches for SupplyRequest. For example, to update a Slot status to busy, this would be the body:

[
  {
    op: 'replace',
    path: '/status',
    value: 'busy',
  },
],