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+# 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          |