docs: def get_trade_fee(self, **params):
          """Get trade fee.
  
          https://github.com/binance-exchange/binance-official-api-docs/blob/master/wapi-api.md#trade-fee-user_data
  
          :param symbol: optional
          :type symbol: str
          :param recvWindow: the number of milliseconds the request is valid for
          :type recvWindow: int
  
          :returns: API response
  
          .. code-block:: python
  
              {
                  "tradeFee": [
                      {
                          "symbol": "ADABNB",
                          "maker": 0.9000,
                          "taker": 1.0000
                      }, {
                          "symbol": "BNBBTC",
                          "maker": 0.3000,
                          "taker": 0.3000
                      }
                  ],
                  "success": true
              }
  
          :raises: BinanceWithdrawException
  
          """
          res = self._request_withdraw_api('get', 'tradeFee.html', True, data=params)
          if not res['success']:
              raise BinanceWithdrawException(res['msg'])
          return res