.forge/SPRING-ARC-SPLIT-1783827796-attempt-5.md

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+# SPRING-ARC-SPLIT-1783827796-attempt-5
+
+Forge 이슈 작업 브랜치 `forge/SPRING-ARC-SPLIT-1783827796-attempt-5`.

docs/architecture/adr-payment-boundary.md

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+# Architectural Decision Record for Payment Boundary
+
+## Context
+In order to ensure the integrity and separation of concerns within the payment processing system, we need to define firm boundaries between various components: Controller, Service, Repository, Domain, and Integration. This helps in minimizing unintended dependencies that may arise during development.
+
+## Decision
+The payment boundary will be strictly defined such that:
+- Controllers interact only with Services.
+- Services interact only with Repositories and Domains (no direct interaction between Services and Controllers).
+- Repositories handle data access and business logic is encapsulated within Services.
+- Integration with external systems is managed separately and will not cross into the Service layer.
+
+## Alternatives
+1. Allow Services to directly interact with Repositories for data retrieval.  
+   **Consequences:** Increases coupling and can lead to issues with data integrity and business logic being bypassed.
+2. Utilize an Event-Driven Architecture for communications between Services and Integrations.  
+   **Consequences:** Increased complexity and potential performance hits.
+
+## Consequences
+By setting these boundaries, we are ensuring that changes in one component do not inadvertently affect others, thus maintaining a clean architecture that adheres to SOLID principles. Scalability and maintainability of the system are expected to improve as team members can work more independently without overlapping concerns.

docs/architecture/package-map.md

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+# Package Responsibility and Forbidden Dependencies
+
+| Package       | Responsibility                                          | Forbidden Dependencies        |
+|---------------|-------------------------------------------------------|-------------------------------|
+| Controller    | Handles incoming requests and responses                | Service -> Repository         |
+| Service       | Contains business logic and service level operations   | Repository -> Service         |
+| Repository    | Manages data persistence and retrieval                  | Controller -> Repository      |
+| Domain        | Defines domain model and logic                          | Not applicable                |
+| Integration    | Interfaces with external services                        | Service -> Integration        |

docs/architecture/transaction-sequence.md

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+```mermaid
+sequenceDiagram
+    participant Controller
+    participant Service
+    participant Repository
+    participant Domain
+    participant Integration
+
+    Controller->>Service: processPayment()
+    Service->>Repository: savePayment()
+    Repository-->>Service: paymentSaved
+    Service-->>Controller: paymentProcessed
+
+    alt External API call
+        Service->>Integration: sendPaymentRequest()
+        Integration-->>Service: paymentResponse
+    end
+
+    opt Within DB transaction
+        Service->>Repository: beginTransaction()
+        Repository-->>Service: transactionStarted
+        Service->>Repository: commitTransaction()
+    end
+    Note over Service: Success (commit)
+
+    opt External Failure
+        Service->>Integration: sendPaymentRequest()
+        Integration-->>Service: paymentFailure
+        Service->>Repository: rollbackTransaction()
+        Repository-->>Service: transactionRolledBack
+    end
+
+    opt DB Failure
+        Service->>Repository: throwException()
+        Repository-->>Service: exceptionOccurred
+        Service->>Repository: rollbackTransaction()
+        Repository-->>Service: transactionRolledBack
+    end
+```