Financial onboarding flows are easy to test when everything works. A user submits valid information, an API returns success, and the application moves to the next screen.

Real systems are less predictable.

A network request may time out after the server has processed it. A third-party verification service may become unavailable. A user may tap Submit twice, refresh a page, or leave halfway through an application.

In financial applications, these situations can create duplicate records, confusing statuses, privacy issues, and unnecessary support requests.

Testing the happy path is necessary, but it is not sufficient. Here is a practical approach to testing failure paths in fintech onboarding workflows.

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