# Diagnostic

- [SAF Diagnostic](https://helpcenter.verifone.com/p630-error-page/diagnostic/saf-diagnostic.md)
- [Last Transaction Information](https://helpcenter.verifone.com/p630-error-page/diagnostic/last-transaction-information.md)
- [Network Information Check](https://helpcenter.verifone.com/p630-error-page/diagnostic/network-information-check.md)
- [Merchant Information](https://helpcenter.verifone.com/p630-error-page/diagnostic/merchant-information.md): You can use this guide to check the Merchant ID and the Terminal ID linked to your terminal.
- [Testing Chip Reader](https://helpcenter.verifone.com/p630-error-page/diagnostic/testing-chip-reader.md)


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://helpcenter.verifone.com/p630-error-page/diagnostic.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.