In order to have a clean architecture that helps you create easy to write and test applications, we can use Hexagonal Architecture. To achieve that, we encapsulate user story business rules inside a UseCase or Interactor object. We build the UseCase request from our framework request, instantiate the UseCase and all its dependencies and then execute it. We get the response and act accordingly based on it. If our framework has a Dependency Injection component you can use it to simplify the code.

The same UseCase objects can be used from different delivery mechanisms in order to allow users access the features from different clients (web, API, console, and so on.)

For testing, play with mocks that behave like all the interfaces defined so special cases or error flows can also be covered. Enjoy the good job done.