code: def past_trades(self, timestamp=0, symbol='btcusd'):
          
          payload = {
              "request": "/v1/mytrades",
              "nonce": self._nonce,
              "symbol": symbol,
              "timestamp": timestamp
          }
  
          signed_payload = self._sign_payload(payload)
          r = requests.post(self.URL + "/mytrades", headers=signed_payload, verify=True)
          json_resp = r.json()
  
          return json_resp
docs: Fetch past trades
          :param timestamp:
          :param symbol:
          :return: