From 1917bdf0f1b5265b022d2cf9424c2fe1adc98b4c Mon Sep 17 00:00:00 2001
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Date: Sun, 12 Jul 2026 07:37:07 +0000
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 docs/architecture/transaction-sequence.md | 23 +++++++++++++++++++++++
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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 PaymentGateway
+    participant TransactionDB
+    User->>PaymentGateway: Initiate Payment
+    alt Successful Payment
+        PaymentGateway-->>TransactionDB: Store Transaction
+        TransactionDB-->>PaymentGateway: Confirm Transaction Stored
+        PaymentGateway-->>User: Payment Successful
+    else External Failure
+        PaymentGateway-->>User: Payment Gateway Error
+    else DB Failure
+        PaymentGateway-->>User: Payment Processing Error
+        TransactionDB-->>PaymentGateway: DB Error Occurred
+    end
+    opt Commit Transaction
+        TransactionDB-->>User: Commit Success
+    end
+    opt Rollback Transaction
+        TransactionDB-->>User: Rollback Success
+    end
+```
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