Impact on custom code that interacts directly with the Storage Layer
If you perform a minimal upgrade only, any custom client code that interacts directly with the Storage Layer continues to work normally. But in the new RESTful, service-based setup, your clients can no longer interact directly with the Storage Layer. They instead need to interact with the microservices, who in turn talk to the Storage Layer. Consult the API references for the new Content Delivery APIs to find out more.