From f5923a3a7a6062ef775a1e34645c01d651b86fbb Mon Sep 17 00:00:00 2001
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Date: Sun, 12 Jul 2026 05:19:41 +0000
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 docs/architecture/transaction-sequence.md | 23 +++++++++++++++++++++++
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diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
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+```mermaid
+sequenceDiagram
+    participant User
+    participant PaymentGateway
+    participant Database
+
+    User->>PaymentGateway: Initiate payment
+    PaymentGateway->>User: Payment status (success)
+    User->>Database: Save transaction
+    Database-->>User: Transaction saved
+
+    %% External failure scenario
+    User->>PaymentGateway: Initiate payment
+    PaymentGateway-->>User: Payment status (failure)
+    User->>Database: Log failure reason
+
+    %% Database failure scenario
+    User->>PaymentGateway: Initiate payment
+    PaymentGateway->>User: Payment status (success)
+    User->>Database: Save transaction
+    Database-->>User: Transaction failed (DB error)
+    Note right of User: Rollback transaction
+```
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