결제 전환 목표 아키텍처 정의 (2/2) #2

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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
```