Change of balance

param

format: balance

eg: balance

push

{
  "topic": "balance", 
  "event": "balance", 
  "data": {
    "a": "123",           // accountId                     
    "t": 1656043204763,   // time happened time
    "c": "btc",           // currency
    "b": "123",           // all spot balance
    "f": "11",            // frozen
    "z": "SPOT",           // bizType [SPOT,LEVER]
    "s": "btc_usdt"       // symbol
  }
}