code: def returnTradeHistory(self, currencyPair, start=None, end=None):
          
          return self._public('returnTradeHistory', currencyPair=currencyPair,
                              start=start, end=end)
docs: Returns the past 200 trades for a given market, or up to 50,000
          trades between a range specified in UNIX timestamps by the "start"
          and "end" GET parameters.