BREAKING The fields "MaxInvestmentAmt" and "MaxInvestmentAmtDescription" have been removed.
IMPROVED New sections added to section: Cost/TradeCost/(Long/Short)/FundCost: "EntryCost" and "ExitCost".
IMPROVED New section added to Options section: "PaymentBreakdown".
IMPROVED New fields added: "ClientNote".
IMPROVED New fields added to ParticipatingAccountsInfo: "ClientId", "ClientKey".
IMPROVED New field added to MultiLeg order PATCH method: "OrderDuration".
Please also observe the announced planned changes, which may be potentially breaking.
Currently we have two such changes scheduled - one on January 1st and one on or after April 2022.