Business events in the business events catalog aren't active by default. Business events can be activated from the Business events catalog form, by selecting the Activate button and providing legal entity and endpoint details. If you leave the Legal entity field blank, the selected business events will be activated in all legal entities. 

When business processes such as purchase confirmation run and the corresponding business event, that is, PurchaseOrderConfirmedBusinessEvent is active, a business events payload is generated as part of the transaction and stored in the business events queue.

Delivery of the business event payload to the endpoint is done in an asynchronous manner. Dedicated threads are allocated to process business events by the system, which ensures faster processing of business events. In case of failure of delivery (such as if the messaging service is down), business events are available in the failed queue and can be processed manually.