curl --request DELETE \
  --url https://synthesis.trade/api/v1/wallet/pol/{wallet_id}/orders \
  --header 'X-API-KEY: <api-key>'

{
  "success": true,
  "response": {
    "order_ids": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
      "a1b2c3d4-e5f6-7890-abcd-ef1234567890"
    ]
  }
}