设置仓位模式 (SIGNED)

curl 
 -H 'X-BM-KEY:{{AccessKey}}'
 -H 'X-BM-TIMESTAMP:{{currentTime}}'
 -H 'X-BM-SIGN:{{SIGN}}' 
 -X POST -d '{
  "position_mode":"one_way_mode"
}'
https://cloud-api.wooxpro.com/contract/private/set-position-mode

{
  "code": 1000,
  "trace": "0cc6f4c4-8b8c-4253-8e90-8d3195aa109c",
  "message": "Ok",
  "data": {
    "position_mode":"one_way_mode"
  }
}