What is the difference between synchronous and asynchronous integration patterns in Dynamics 365 CE, and when should each be used?
Question
Understand the key differences between synchronous and asynchronous integration patterns in Dynamics 365 CE and Dataverse.
Explore real-world scenarios involving APIs, plugins, Power Automate, Azure Functions, messaging, and external enterprise systems.
Learn how factors such as response time, reliability, scalability, transaction requirements, and failure handling influence integration design.
A practical discussion for aspiring Dynamics 365 CE developers, integration specialists, solution architects, and technical consultants.
Answers
The fundamental difference is whether the calling process waits for the integration to complete. Synchronous processing is appropriate when the caller immediately requires a response or the business transaction cannot continue until validation is complete. Asynchronous processing is better for operations that can happen independently, such as notifications, data synchronization or long-running external processing.
For example, validating a business rule during a Dataverse transaction may require synchronous server-side logic, while sending information to an external application can often be handled asynchronously. Dataverse supports multiple integration approaches, including plug-ins, webhooks, Azure Service Bus and APIs.
The architecture decision should consider latency, reliability, transaction boundaries, retries, failure handling and scalability.
Interview-level question: If an external ERP is temporarily unavailable, should a customer transaction fail immediately—or should the request be accepted and processed later? The answer depends on the business consistency requirement.