curl --request POST \
  --url https://traderapi.us-east-1.privatelink.preprod.polymarketexchange.com/api/v1beta1/cancel_order_list \
  --header 'Content-Type: application/json' \
  --data '
{
  "requests": [
    {
      "order_id": "1ABC2DEF3GHI4",
      "symbol": "aec-nfl-buf-nyj-2025-01-15"
    }
  ]
}
'

{
  "responses": [
    {}
  ]
}