curl --request POST \
  --url https://api.perpo.trade/v1/client/margin_mode \
  --header 'Content-Type: application/json' \
  --header 'perpo-account-id: <perpo-account-id>' \
  --header 'perpo-key: <perpo-key>' \
  --header 'perpo-signature: <perpo-signature>' \
  --header 'perpo-timestamp: <perpo-timestamp>' \
  --data '
{
  "symbol": "PERP_BTC_USDC",
  "default_margin_mode": "ISOLATED"
}
'

{
  "success": true,
  "timestamp": 1702989203989
}