curl --request GET \
  --url http://localhost:3000/v1/scanner/pin/staff

{
  "staff": [
    {
      "id": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "email": "<string>",
      "deputy_employee_id": 123,
      "role": "<string>",
      "operational_units": null
    }
  ],
  "error": "<string>",
  "message": "<string>"
}