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# IBKR TWS API

* A new [Contract Reference](/tws-api/contracts/introduction) tab has been added to the TWS API documentation. This section defines contract object structures for an array of security types and should be used as a reference for contract discovery.
* Update links on [Request Watchlist Data](/tws-api/doc/md/streaming-data#request-watchlist-data)
* Removed legacy "cancel" requirements for [WhatIf documentation](/tws-api/doc/orders/test-order-impact-what-if).