> For the complete documentation index, see [llms.txt](https://docs.tiun.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tiun.io/guides/testing/debugging.md).

# Debugging

When something does not behave as expected, start with SDK logging and a short checklist of common causes before escalating.

## Debug mode

Pass **`debug: true`** in the `tiun.init` configuration to turn on **console logging** from the SDK. That helps you see initialization, event flow, and errors during development.

```javascript
tiun.init({
  snippetId: 'YOUR_SNIPPET_ID',
  language: 'en', // 'en' | 'de' | 'fr'
  debug: true,
});
```

Disable or omit `debug` in your live builds if you prefer minimal client noise.

## Common issues

| Issue                        | Likely cause                                | What to try                                                                                                                                                  |
| ---------------------------- | ------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Events not firing            | SDK not initialized                         | Call `tiun.init()` before subscribing to events.                                                                                                             |
| Checkout not opening         | Wrong or stale product ID                   | Live and sandbox have separate catalogs — compare the ID to the dashboard view for the same environment your SDK uses (`sandbox: true` → sandbox toggle on). |
| Connect overlay not opening  | SDK not initialized or wrong environment    | Ensure `tiun.init()` has been called and the snippet is configured for a time-based product.                                                                 |
| Sandbox payments not working | App and dashboard on different environments | Use sandbox snippet ID and `p-test-...` IDs with `sandbox: true`; confirm the dashboard **Sandbox** toggle is on while configuring test data.                |
| User state not updating      | Relying only on snapshot properties         | Listen for **`userChange`** and update UI from the event payload.                                                                                            |
| Session not restoring        | Different browser or cleared storage        | Sessions are per browser; clearing cookies or site data clears the session.                                                                                  |

## Event reference

For a full list of events and payloads, see [SDK events](/sdk/reference/events.md).

## Support

If logs and the table above do not resolve the issue, contact <support@tiun.app> with steps to reproduce and, when possible, snippet ID and environment (sandbox or live).


---

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