Request message format
param format
Each entry in params is a plain channel name (no @accountId suffix — the account is taken from the handshake token).
Channels: balance , order , trade , entrust , pred_position .
subscribe
{
"method": "subscribe",
"params": [
"balance",
"order"
],
"id": "{id}"
}
unsubscribe
{
"method": "unsubscribe",
"params": [
"balance",
"order"
],
"id": "{id}"
}