curl --request GET \
  --url https://api.sumvin.com/v0/user/rules/{rule_id}

{
  "_links": {},
  "rule": {
    "id": "<string>",
    "name": "<string>",
    "rule_prompt": "<string>",
    "applies_to": "<string>",
    "priority": 123,
    "created_at": 123,
    "updated_at": 123
  }
}