curl --request GET \
  --url http://localhost:3000/projects/{projectId}/environments/{envId}/flags/{flagId}/value \
  --header 'Authorization: Bearer <token>'

{
  "statusCode": 123,
  "message": "OK",
  "data": {
    "value": "<unknown>",
    "type": "boolean",
    "targeting_rules": [
      {
        "type": "rule",
        "attribute": "<string>",
        "operator": "eq",
        "value": "<string>"
      }
    ],
    "key": "<string>",
    "off_variation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "rollout": {
      "strategy": "gradual",
      "target_percentage": 50,
      "increment": 50,
      "interval_hours": 1,
      "salt": "<string>",
      "start_at": "2023-11-07T05:31:56Z"
    }
  }
}