code: def returnTradeHistory(self, currencyPair='all', start=None, end=None, limit=500):
          
          return self._private('returnTradeHistory', currencyPair=currencyPair,
                               start=start, end=end, limit=limit)
docs: Returns your trade history for a given market, specified by the
          "currencyPair" POST parameter. You may specify "all" as the
          currencyPair to receive your trade history for all markets. You may
          optionally specify a range via "start" and/or "end" POST parameters,
          given in UNIX timestamp format; if you do not specify a range, it will
          be limited to one day.