redi redi_api api excel vba c# orders python dde excel api order redi api outside visual studio rest api python api redi order entry demo api redi python sending orders algo trading redi api python rediapi portfolio trader redi plus cancel london e mini visual studio 2013 automation python redi api connection com position monitor transaction python real-time api links performance price incorrect example error message trades send excel vba vwap link redis csv cancel all startegy portfoliotrader cash creation pnl options on futures orderrefkey locate one symbol api enquiry value options clientdata redi type library Service currency conversion rates order fields message monitor .net rediplus excel vba api getcell snapshot dde links cell reference doc python wrapper for redi slow redilink error cloud bug stage ATS redi api documentation postion strategy l2 hot keys quotes account no update message sending orders via redi using batch mode futures broker