Are TWS Api Clients required to send the new Exchange name from day 1 a product moves from oldExch to newExch ?

REQUEST NEW PRODUCT VIA TICKET

To request that a new product be added for trading, please submit a ticket with the name, ISIN or CUSIP and exchange it is listed on. Select Products as the ticket category followed by …

Yes, all clients trading U.S. products are subject to T+1 settlement…

As a general rule, the TWS is backwards compatible with the API and when upgrading the TWS an API upgrade is typically not required. Clients may wish to consider an API upgrade, however, to take advantage of any new features subsequently introduced. …

No. FIX clients are not required to send new exchange codes immediately. IBKR will try to resolve the contract based on the exchange received from the FIX client. If the provided exchange code is one of the old codes, IBKR will automatically switch to the new exchange code to resolve the contract. When IBKR sends back the order status and trades, the original exchange code received from the client will be provided…