curl --request POST \
  --url https://api.polymarket.us/v1/orders/batched/cancel \
  --header 'Content-Type: application/json' \
  --header 'X-PM-Access-Key: <api-key>' \
  --header 'X-PM-Signature: <api-key>' \
  --header 'X-PM-Timestamp: <api-key>' \
  --data '
{
  "orders": [
    {
      "orderId": "<string>",
      "marketSlug": "<string>"
    }
  ]
}
'

{
  "canceledOrderIds": [
    "<string>"
  ]
}