# 3.3.3.2 Use integrations

Consider potential integration points and interoperability requirements early in the design process, involving relevant stakeholders, including the Building Blocks development team.

* Identify functionalities that can be provided by other services, for example, departmental registries.
* Integrate these services using their APIs.
* Test the integrations to ensure they work correctly.
* Be prepared to handle any downtime or changes to these services.