AdministrableProductDefinition on the FHIR specification website.

A medicinal product in the final form which is suitable for administering to a patient (after any mixing of multiple components, dissolution etc. has been performed).

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

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