Retrieves an user notification rule

curl --request GET \
  --url https://api.rootly.com/v1/notification_rules/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "2005ae56-db07-407b-ba2e-f33d4a5524d2",
    "type": "user_notification_rules",
    "attributes": {
      "user_id": 613,
      "delay": 1,
      "position": 2,
      "user_email_address_id": null,
      "user_call_number_id": null,
      "user_sms_number_id": null,
      "user_device_id": null,
      "enabled_contact_types": [
        "email"
      ],
      "created_at": "2026-01-03T21:30:18.942-08:00",
      "updated_at": "2026-01-03T21:30:18.947-08:00"
    }
  }
}