결제 전환 목표 아키텍처 정의 (SPRING-ARC-REVIEW-1783824683)
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docs/architecture/transaction-sequence.md
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docs/architecture/transaction-sequence.md
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```mermaid
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sequenceDiagram
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participant User
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participant PaymentService
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participant Database
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participant ExternalService
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User->>PaymentService: 결제 요청
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PaymentService->>Database: 트랜잭션 시작
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alt 정상 흐름
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PaymentService->>ExternalService: 결제 처리 요청
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ExternalService-->>PaymentService: 결제 성공
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PaymentService->>Database: 트랜잭션 커밋
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else 외부 실패
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PaymentService->>Database: 트랜잭션 롤백
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else DB 실패
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PaymentService->>Database: 트랜잭션 롤백
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end
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```
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