Retrieves an user notification rule

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

{
  "data": {
    "id": "73ebd504-135b-4c57-be9b-8a03afd79949",
    "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": "2025-09-15T06:39:51.532-07:00",
      "updated_at": "2025-09-15T06:39:51.542-07:00"
    }
  }
}