D365 Business events are available in Platform update 24 and later. When there is a need to communicate to an external system, a business action can generate business events via endpoints. Then business events can be consumed via Azure messaging. Check out business events here https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/business-events/home-page It is really interesting to see real time application that use Signal IR Service bindings in Azure Functions to consume these events from event brokers such as Azure Service Bus Queue, Azure Service Bus Topic, Azure Event Grid, Azure Event Hub, HTTPs, Microsoft Flow. Developers can easily push updates to the UI with just few lines of code. https://azure.microsoft.com/en-us/blog/real-time-serverless-applications-with-the-signalr-service-bindings-in-azure-functions/