Using RESTful APIs and the OData service, any third-party application can directly integrate with Finance and Operations. However, when using asynchronous integration patterns or the event-driven architecture, you must use messaging services or middleware as an integration broker to integrate with Finance and Operations.

In the previous, section, we learned that many Azure messaging services are supported out of the box when using business events and data feeds. There are several other middleware integration tools that can be used to integrate Dynamics 365 for Finance and Operations with third-party applications. This section will briefly talk about these technologies and middleware systems.