Retrieves an user notification rule

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

{
  "data": {
    "id": "04d3d146-1ecf-4a80-bb8a-0d8261f8a0ce",
    "type": "user_notification_rules",
    "attributes": {
      "user_id": 509,
      "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": "2025-09-01T03:43:57.903-07:00",
      "updated_at": "2025-09-01T03:43:57.916-07:00"
    }
  }
}