APIResult::Type subscribeMD(FeedID_t feedID, MarketID_t marketID); APIResult::Type subscribeOF(FeedID_t feedID);
APIResult::Type unsubscribeMD(FeedID_t feedID, MarketID_t marketID); APIResult::Type unsubscribeOF(FeedID_t feedID);
APIResult::Type unsubscribeAll();'