Published versioned interfaces: An efficient version control to indicate when something, deprecated is key. Not only that, but it will also indicate what the new version is and when the deprecated version will be deactivated permanently.

Small published interfaces: A large payload is much more susceptible to change than a more specialized payload. Applying the concepts of DDD on these payloads is very healthy.

Published external interfaces: Do not create the concept of published interfaces for internal development teams. This creates a slow process of change and implementation features.