결제 전환 목표 아키텍처 정의 (2/2) #1
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docs/architecture/transaction-sequence.md
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docs/architecture/transaction-sequence.md
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```mermaid
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sequenceDiagram
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participant User
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participant PaymentGateway
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participant PaymentService
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participant Database
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User->>+PaymentService: Start Payment
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PaymentService->>+PaymentGateway: Process Payment
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PaymentGateway-->>-PaymentService: Payment Success
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PaymentService->>Database: Record Payment
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Database-->>-PaymentService: Payment Recorded
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PaymentService-->>-User: Payment Confirmed
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%% External Failure
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User->>+PaymentService: Start Payment
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PaymentService->>+PaymentGateway: Process Payment
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PaymentGateway-->>-PaymentService: Payment Failed
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PaymentService-->>-User: Payment Failed
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%% DB Failure
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User->>+PaymentService: Start Payment
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PaymentService->>+PaymentGateway: Process Payment
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PaymentGateway-->>-PaymentService: Payment Success
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PaymentService->>Database: Record Payment
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Database-->>-PaymentService: DB Failure
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PaymentService-->>-User: Payment Processing Error
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%% Commit/Rollback
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Note over PaymentService: Commit if successful
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Note over PaymentService: Rollback if there's an error
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```
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