결제 전환 목표 아키텍처 정의 (2/2) #2

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forge-bot wants to merge 2 commits from forge/iss-2499ff1ad79a-attempt-3-run-30d98199f9aa into main
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# iss-2499ff1ad79a-attempt-3-run-30d98199f9aa
Forge 이슈 작업 브랜치 `forge/iss-2499ff1ad79a-attempt-3-run-30d98199f9aa`.

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```mermaid
sequenceDiagram
participant User
participant PaymentGateway
participant Application
participant Database
User->>Application: Initiate Payment
Application->>PaymentGateway: Process Payment
alt Successful Payment
PaymentGateway-->>Application: Payment Approved
Application->>Database: Commit Transaction
Database-->>Application: Transaction Committed
Application-->>User: Payment Successful
else External Failure
PaymentGateway-->>Application: Payment Error
Application-->>User: Payment Failed
else DB Failure
Application->>Database: Attempt Transaction
Database-->>Application: Transaction Error
Application->>Database: Rollback Transaction
Database-->>Application: Transaction Rolled Back
Application-->>User: Payment Failed
end
```