curl --request POST \
  --url https://demo-api.mobula.io/api/2/perp/lighter/cancel-order \
  --header 'Content-Type: application/json' \
  --data '
{
  "timestamp": 123,
  "signature": "<string>",
  "orderIndex": 123,
  "marketId": 123
}
'

{
  "success": true,
  "data": null
}