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docs/architecture/transaction-sequence.md Normal file
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```mermaid
sequenceDiagram
participant User
participant PaymentGateway
participant Bank
%% Normal flow
User ->> PaymentGateway: Request Payment
PaymentGateway ->> Bank: Process Payment
Bank -->> PaymentGateway: Payment Approved
PaymentGateway -->> User: Payment Confirmation
%% External failure branch
User ->> PaymentGateway: Request Payment
PaymentGateway ->> Bank: Process Payment
Bank -->> PaymentGateway: Payment Declined
PaymentGateway -->> User: Payment Declined Message
%% DB failure branch
User ->> PaymentGateway: Request Payment
PaymentGateway ->> Bank: Process Payment
Bank -->> PaymentGateway: DB Error
PaymentGateway -->> User: Payment Failed Due to Error
Note over PaymentGateway: Rollback transaction if needed
```