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결제 전환 목표 아키텍처 정의 (SPRING-ARC-BOUNDARY-1783841726)
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```mermaid
sequenceDiagram
participant User
participant Controller
participant Service
participant Repository
participant PaymentGateway
User->>Controller: 결제 요청
Controller->>Service: 결제 처리 요청
Service->>Repository: 트랜잭션 시작
alt 정상 흐름
Service->>PaymentGateway: 결제 요청
PaymentGateway-->>Service: 결제 성공
Service->>Repository: 트랜잭션 커밋
else 외부 실패
Service->>PaymentGateway: 결제 요청
PaymentGateway-->>Service: 결제 실패
Service->>Repository: 트랜잭션 롤백
else DB 실패
Service->>Repository: 트랜잭션 시작
Repository-->>Service: DB 오류
Service->>Repository: 트랜잭션 롤백
end
Controller-->>User: 결제 결과 반환
```