Reference > Payments subsystem > Payment plug-in specification

Financial transaction execution flow

The Financial transaction execution flow illustrates how a financial transaction occurs, and how WebSphere Commerce interacts with the payment plug-in.

1. The external application, such as WebSphere Commerce, requests an approve transaction.

2. The Payment plug-in controller looks up the Payment that the approve transaction will be executed against.

3. The Payment plug-in controller looks up the PaymentInstruction that will service the request.

4. The Payment plug-in controller creates a FinancialTransaction that describes the approve transaction.

5. The Payment plug-in controller finds the target plug-in to process the financial transaction.

6. The Payment plug-in controller creates a PluginContext object with the plug-in deployment descriptor data.

7. The Payment plug-in controller invokes the Plugin.approve() method.

8. The plug-in returns the updated FinancialTransaction or throws an exception.

9. The plug-in returns the results to the external application.

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