curl --request GET \
  --url https://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}

{
  "multivariate_contract": {
    "collection_ticker": "<string>",
    "series_ticker": "<string>",
    "title": "<string>",
    "description": "<string>",
    "open_date": "2023-11-07T05:31:56Z",
    "close_date": "2023-11-07T05:31:56Z",
    "associated_events": [
      {
        "ticker": "<string>",
        "is_yes_only": true,
        "active_quoters": [
          "<string>"
        ],
        "size_max": 123,
        "size_min": 123
      }
    ],
    "associated_event_tickers": [
      "<string>"
    ],
    "is_ordered": true,
    "is_single_market_per_event": true,
    "is_all_yes": true,
    "size_min": 123,
    "size_max": 123,
    "functional_description": "<string>"
  }
}