Previous to release 11.5.7 and TCA mini-pack 11i.HZ.G, customizations for the processing of Customer information in the Trading Community Architecture were implemented by User Hooks. These hooks were procedure calls from the seeded TCA PL/SQL package code to program stubs that could be enhanced by users with custom code. These hooks have been removed and replaced by Business Event Callouts that are handled by the Workflow Business Event System. The use of this powerful new feature will be discussed in detail.