.forge/SPRING-ARC-REF-FINAL-1783833422-attempt-4.md

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+# SPRING-ARC-REF-FINAL-1783833422-attempt-4
+
+Forge 이슈 작업 브랜치 `forge/SPRING-ARC-REF-FINAL-1783833422-attempt-4`.

docs/architecture/adr-payment-boundary.md

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+# Payment Boundary Architectural Decision Record (ADR)
+
+## Context
+This document outlines the architectural decision regarding the payment boundary within our application. The payment system is critical for our operations, interfacing with various external services and ensuring secure and efficient transactions.
+
+## Decision
+We will establish a clear payment boundary by implementing a microservices architecture. The payment service will be a standalone service, responsible for all payment processing tasks, including initiating payments, handling callbacks, and managing transaction states. The service will communicate with other services through well-defined APIs.
+
+## Alternatives
+1. **Monolith Approach**: Integrate the payment processing within the main application.
+   - **Consequences**: Increased complexity in the main application, making it harder to maintain.
+
+2. **Serverless Approach**: Use serverless functions for handling payments.
+   - **Consequences**: Potentially higher latency and challenges with state management across serverless executions.
+
+## Consequences
+By adopting a microservices architecture for our payment boundary, we ensure scalability and independence of the payment service. This allows us to modify and upgrade the payment system without impacting the entire application. Additionally, this isolation improves security and fault tolerance, as payment processing can be monitored and managed independently.