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Date: Sun, 12 Jul 2026 05:18:35 +0000
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 docs/architecture/transaction-sequence.md | 46 +++++++++++++++++++++++
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 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
+    participant Controller
+    participant Service
+    participant Repository
+    participant Database
+
+    User->>Controller: 결제 요청
+    Controller->>Service: 결제 처리 요청
+    Service->>Repository: 결제 정보 저장
+    Repository->>Database: DB에 저장
+    Database-->>Repository: 저장 완료
+    Repository-->>Service: 저장 완료
+    Service-->>Controller: 처리 완료
+    Controller-->>User: 결제 완료
+
+    %% 외부 실패 흐름
+    User->>Controller: 결제 요청
+    Controller->>Service: 결제 처리 요청
+    Service->>Repository: 결제 정보 저장
+    Repository->>Database: DB에 저장
+    Database-->>Repository: 저장 실패
+    Repository-->>Service: 저장 실패
+    Service-->>Controller: 처리 실패
+    Controller-->>User: 결제 실패
+
+    %% DB 실패 흐름
+    User->>Controller: 결제 요청
+    Controller->>Service: 결제 처리 요청
+    Service->>Repository: 결제 정보 저장
+    Repository->>Database: DB에 저장
+    Database-->>Repository: DB 오류
+    Repository-->>Service: DB 오류
+    Service-->>Controller: 처리 실패
+    Controller-->>User: 결제 실패
+
+    %% Commit/Rollback 경계
+    alt 정상 흐름
+        Service->>Database: Commit
+    else 외부 실패
+        Service->>Database: Rollback
+    else DB 실패
+        Service->>Database: Rollback
+    end
+```
\ No newline at end of file