def place_order(self, amount, price, side, ord_type, symbol='btcusd', exchange='bitfinex'):
        """
        Submit a new order.
        :param amount:
        :param price:
        :param side:
        :param ord_type:
        :param symbol:
        :param exchange:
        :return:
        """
        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
Submit a new order.
        :param amount:
        :param price:
        :param side:
        :param ord_type:
        :param symbol:
        :param exchange:
        :return: