curl --request POST \
  --url https://api.hypereth.io/v1/aster/fapi/v1/positionSide/dual \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data dualSidePosition=true \
  --data recvWindow=123 \
  --data timestamp=123

{
  "code": 123,
  "msg": "<string>"
}