# Package Responsibility and Forbidden Dependencies

| Package         | Responsibility                                          | Forbidden Dependencies  |
|------------------|------------------------------------------------------|--------------------------|
| controller       | Handle user requests, validate inputs, and respond   | domain                   |
| service          | Contain business logic and orchestration              | repository               |
| repository       | Manage data access and persistence                     | service                  |
| domain           | Define core business models and rules                 | integration              |
| integration      | Interface with external systems (e.g. payment gateways) | domain, service          |