Look up one or more orders by ID (64 hexadecmial characters).

        :param order_id: Order ID or list of order IDs.
        :type order_id: str | unicode | [str | unicode]
        :return: Order details.
        :rtype: [dict]

def lookup_order(self, order_id):
        """Look up one or more orders by ID (64 hexadecmial characters).

        :param order_id: Order ID or list of order IDs.
        :type order_id: str | unicode | [str | unicode]
        :return: Order details.
        :rtype: [dict]
        """
        self._log('look up order(s) {}'.format(order_id))
        return self._rest_client.post(
            endpoint='/lookup_order',
            payload={'id': order_id}
        )