결제 전환 목표 아키텍처 정의 (SPRING-ARC-RESILIENT-1783826170)
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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 Service
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participant Repository
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participant PaymentGateway as PG
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User->>Service: 결제 요청
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Service->>Repository: 결제 정보 저장
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alt 결제 성공
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Service->>PG: 결제 요청
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PG-->>Service: 결제 성공 응답
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Service-->>User: 결제 완료 응답
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else 외부 실패
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Service-->>User: 결제 실패 응답
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else DB 실패
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Service->>Repository: 롤백 요청
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Repository-->>Service: 롤백 완료
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Service-->>User: 결제 실패 응답
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end
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```
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