결제 전환 목표 아키텍처 정의 (SPRING-ARC-VERIFIED-1783826844)

docs/architecture/adr-payment-boundary.md

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+# Payment Boundary Decision Record
+
+## Context
+In developing the architecture for the payment processing system, our objective is to ensure a clear separation between the application logic and the payment gateways. This boundary will help maintain a clean architecture and allow for easier testing and maintainability.
+
+## Decision
+We have decided to implement a port and adapter pattern where the payment gateway is accessed via a defined interface (port) rather than being directly referenced in the domain model. This ensures that our domain logic remains agnostic of the specific implementations of payment gateways.
+
+## Alternatives
+1. Direct coupling with the payment gateway: This approach could lead to tight coupling and hinder maintainability and testability.
+2. Abstracting payment logic into a service layer: While this maintains separation, it increases complexity and could introduce overhead. 
+
+## Consequences
+- By adhering to the port and adapter pattern, we ensure our domain model remains clean and focused on business logic.
+- Changes in payment gateway implementations can be managed without affecting the domain logic, leading to improved agility.