From ca4352a2183aae9f5786c995e100a317da1ec12e Mon Sep 17 00:00:00 2001
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Date: Sun, 12 Jul 2026 03:58:17 +0000
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---
 docs/architecture/transaction-sequence.md | 37 +++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 docs/architecture/transaction-sequence.md

diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
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+```mermaid
+sequenceDiagram
+    participant User as 사용자
+    participant Controller as 결제Controller
+    participant Service as 결제Service
+    participant Gateway as 결제Gateway
+    participant DB as 데이터베이스
+
+    User->>Controller: 결제 요청
+    Controller->>Service: 결제 처리 요청
+    Service->>Gateway: 결제 요청 전달
+    Gateway->>Service: 결제 결과
+    Service->>DB: 결제 정보 저장
+    DB-->>Service: 저장 결과
+    Service-->>Controller: 결제 처리 결과
+    Controller-->>User: 결제 결과 응답
+
+    rect rgb(200, 200, 200) 
+    Note over Service: Commit 경계
+    end
+
+    rect rgb(255, 0, 0) 
+    Note over Service: Rollback 처리
+    end
+
+    Note over User, Gateway: 외부 실패 시
+    Gateway-->>Service: 실패 응답
+    Service-->>Controller: 결제 실패 응답
+    Controller-->>User: 결제 실패 알림
+
+    Note over Service, DB: DB 실패 시
+    Service-->>DB: 저장 실패
+    DB-->>Service: 저장 실패 응답
+    Service-->>Controller: 결제 실패 응답
+    Controller-->>User: 결제 실패 알림
+
+```
\ No newline at end of file