From 14c6732dc7a4d60ec90edf7ff64b769d4209f6cf Mon Sep 17 00:00:00 2001
From: forge-bot <bot@forge.local>
Date: Sun, 12 Jul 2026 03:44:43 +0000
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---
 docs/architecture/transaction-sequence.md | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 docs/architecture/transaction-sequence.md

diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
new file mode 100644
index 0000000..ef94891
--- /dev/null
+++ b/docs/architecture/transaction-sequence.md
@@ -0,0 +1,25 @@
+```mermaid
+sequenceDiagram
+    participant User
+    participant PaymentService
+    participant DomainModel
+    participant Repository
+
+    User->>PaymentService: 결제 요청
+    PaymentService->>DomainModel: 결제 처리
+    DomainModel->>Repository: 데이터 저장
+    Repository-->>DomainModel: 저장 성공
+    DomainModel-->>PaymentService: 처리 완료
+    PaymentService-->>User: 결제 성공
+
+    alt 외부 실패
+        PaymentService-->>User: 결제 실패
+    end
+
+    alt DB 실패
+        DomainModel->>Repository: 데이터 저장 실패
+        Repository-->>DomainModel: 저장 실패
+        DomainModel-->>PaymentService: 롤백
+        PaymentService-->>User: 결제 실패
+    end
+```
\ No newline at end of file