curl --request POST \
  --url https://apiv1.cakeip.com/openapi/account/getUsableTraffic \
  --header 'Content-Type: application/json' \
  --data '
{
  "appKey": "<string>"
}
'

{
  "code": 0,
  "msg": "<string>",
  "data": {
    "fullTraffic": 1000,
    "traffic": 800
  }
}