Testing

Inflow provides a dedicated sandbox environment and a set of test card numbers so you can build and verify your integration without ever processing real funds. This section covers how to get sandbox access and which cards to use to simulate every payment outcome your code needs to handle.

What's in this section

Page	Use it when
Sandbox Environment	Setting up a sandbox account, choosing the right base URL, and generating sandbox API keys.
Test Cards	Simulating successful payments, declines, 3DS challenges, and specific error codes.
Testing Your Mobile Integration	Validating an app-to-web checkout end-to-end: event replay, idempotency, and the "webhook never arrived" case.

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Note
Sandbox and production are fully isolated. Always confirm which environment you are targeting — mixing keys and base URLs across environments returns 401 Unauthorized.