.forge/SPRING-ARC-SEQUENCE-attempt-1-run-a74343256c06.md

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-# SPRING-ARC-SEQUENCE-attempt-1-run-a74343256c06
-
-Forge 이슈 작업 브랜치 `forge/SPRING-ARC-SEQUENCE-attempt-1-run-a74343256c06`.

docs/architecture/transaction-sequence.md

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-```mermaid
-sequenceDiagram
-    participant User as User
-    participant Controller as Controller
-    participant PaymentService as PaymentService
-    participant Gateway as PaymentGateway
-    participant DB as Database
-
-    User ->> Controller: Initiate Payment
-    Controller ->> PaymentService: Process Payment
-    PaymentService ->> Gateway: Call Payment Gateway
-    alt Successful Payment
-        Gateway -->> PaymentService: Payment Success
-        PaymentService ->> DB: Save Transaction
-        DB -->> PaymentService: Transaction Saved
-        PaymentService -->> Controller: Payment Processed
-        Controller -->> User: Payment Successful
-    else External Gateway Failure
-        Gateway -->> PaymentService: Payment Failed
-        PaymentService -->> Controller: Payment Failed
-        Controller -->> User: Payment Failed
-    else DB Failure
-        Gateway -->> PaymentService: Payment Success
-        PaymentService ->> DB: Save Transaction
-        DB -->> PaymentService: DB Error
-        PaymentService ->> Controller: Rollback Transaction
-        Controller -->> User: Payment Failed
-    end
-```