code: def place_order(self, amount, price, side, ord_type, symbol='btcusd', exchange='bitfinex'):
          
          payload = {
  
              "request": "/v1/order/new",
              "nonce": self._nonce,
              "symbol": symbol,
              "amount": amount,
              "price": price,
              "exchange": exchange,
              "side": side,
              "type": ord_type
  
          }
  
          signed_payload = self._sign_payload(payload)
          r = requests.post(self.URL + "/order/new", headers=signed_payload, verify=True)
          json_resp = r.json()
  
          try:
              json_resp['order_id']
          except:
              return json_resp['message']
  
          return json_resp
docs: Submit a new order.
          :param amount:
          :param price:
          :param side:
          :param ord_type:
          :param symbol:
          :param exchange:
          :return: