spring-architecture-done-1783829491/docs/architecture/transaction-sequence.md

sequenceDiagram participant User participant Payment Service participant DB participant External Gateway

User->>Payment Service: Initiate Payment
activate Payment Service
Payment Service->>DB: Begin Transaction
activate DB
DB-->>Payment Service: Transaction Started
deactivate DB
Payment Service->>External Gateway: Request Payment Authorization
activate External Gateway

alt Successful Authorization
    External Gateway-->>Payment Service: Authorization Success
    Payment Service->>DB: Commit Transaction
    activate DB
    DB-->>Payment Service: Transaction Committed
    deactivate DB
    Payment Service-->>User: Payment Successful
else Authorization Failed
    External Gateway-->>Payment Service: Authorization Failure
    Payment Service->>DB: Rollback Transaction
    activate DB
    DB-->>Payment Service: Transaction Rolled Back
    deactivate DB
    Payment Service-->>User: Payment Failed
end

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