In Finance and Operations, business events are implemented in some business processes out of the box. These business events include some common business processes in different modules of the application. Generic workflow business events are generated at various points when processing a Finance and Operations workflow. Power Automate or Logic Apps can be used with workflow business events to build rich notification and approval scenarios. Similar to the workflow business events, alert business events can also be used cross-module with enhanced notification and system integration scenarios. 

The programming model of the business event framework is quite easy and extensible and can be used by the customer and partner developer to create any new business events or even extend payload information of out of the box business events. 

As a developer, you can also extend endpoint types and add your own endpoint if needed. For more information on developing new business events, take a look at the Microsoft documentation page: https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/business-events/business-events-dev-doc.