curl --request PUT \
  --url https://api.woox.io/v3/futures/positionMode \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --header 'x-api-signature: <x-api-signature>' \
  --header 'x-api-timestamp: <x-api-timestamp>' \
  --data '
{
  "positionMode": "<string>"
}
'

{
  "success": true,
  "timestamp": 123
}