> For the complete documentation index, see [llms.txt](https://doc.product-reg.varify.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.product-reg.varify.xyz/advance/serial-number-checker-validator.md).

# Serial number checker/validator

## Overview

Sometimes it is desirable to have a simple interface for customers to validate or check their serial numbers. The app provides such functionality. Here are some use cases:

* Check the authenticity of a product - e.g., a customer bought a product with a serial number and wants to verify its authenticity.
* Provide manuals (or any other downloadable content) to customers who bought a product with a serial number. They just need to enter the serial number to download the assets associated with it.

### Frontend UI

The serial number checker/lookup has a frontend URL:

```
apps/product-registration?action=snlookup
```

The simple UI allows customers to enter a serial number and retrieve the relevant information.

![](/files/gECKrsPWcm0jJff8T8ox)

Once a customer enters a valid serial number, the result will be displayed.

![](/files/SjJkPnMwCbfCZbodftqC)

As indicated by the results above, the following information is provided:

1. Whether the entered serial number is valid or not.
2. Downloadable content associated with the serial number, if available - [see here how to associate downloads with serial numbers](/advance/downloadable-assets-after-submit.md#step-1-upload-serial-number-csv-with-downloadable-assets).
3. The product associated with the serial number - [associate products with serial numbers](/admin/serial-numbers.md#upload-serial-numbers-in-csv).

For more information on how to manage serial numbers, please check [here](/admin/serial-numbers.md).