合约杠杆调整 (SIGNED)

curl 
 -H 'X-API-KEY:{{AccessKey}}'
 -H 'X-API-TIMESTAMP:{{currentTime}}'
 -H 'X-API-SIGN:{{SIGN}}' 
 -X POST -d '{
  "symbol":"ETHUSDT",
  "leverage":"5",
  "open_type":"isolated"
}'
https://cloud-api.wooxpro.com/contract/private/submit-leverage

{
  "code": 1000,
  "message": "Ok",
  "data": {
    "symbol":"ETHUSDT",
    "leverage":"5",
    "open_type":"isolated",
    "max_value":"100"
  },
  "trace": "13f7fda9-9543-4e11-a0ba-cbe117989988"
}