List all appointments

curl --request GET \
  --url https://api.caspen.com/v1/appointments

{
  "data": [
    {
      "id": "<string>",
      "location_id": "<string>",
      "practitioner_id": "<string>",
      "service_id": "<string>",
      "client_id": "<string>",
      "client_package_id": "<string>",
      "case_id": "<string>",
      "starts_at": "<string>",
      "ends_at": "<string>",
      "duration": 123,
      "status": "<string>",
      "confirmed": true,
      "confirmed_at": "<string>",
      "room_id": "<string>",
      "vehicle_id": "<string>",
      "resource_ids": [
        "<string>"
      ],
      "note": "<string>",
      "cancellation_reason_id": "<string>",
      "cancellation_note": "<string>",
      "cancelled_at": "<string>",
      "created_at": "<string>"
    }
  ],
  "links": {
    "prev": "<string>",
    "next": "<string>"
  }
}