AggregateTradesQuantity sums up the quantity from the given trades totalQuantity = SUM(trade1.Quantity, trade2.Quantity, ...).

AggregateTradesQuoteQuantity aggregates the quote quantity from the given trade slice.

CollectTradeFee collects the fee from the given trade slice.

UniversalCancelAllOrders checks if the exchange instance supports the best order cancel strategy it tries the first interface CancelAllOrdersService that does not need any existing order information or symbol information.