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