---
title: "Handle the LibraryLog callback"
url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/extras-com-extension/handle-the-librarylog-callback-com-extension"
source_url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/extras-com-extension/handle-the-librarylog-callback-com-extension.md"
canonical: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/extras-com-extension/handle-the-librarylog-callback-com-extension"
last_modified: "2026-05-23T12:56:20+02:00"
language: "en"
---

# Handle the LibraryLog callback

[View source](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/extras-com-extension/handle-the-librarylog-callback-com-extension.md)

The COM extension for Windows provides feedback from the C library in the form of logs, returned in a callback, that list encountered problems.  After the library initialization call sets the `logLevel`, the information becomes available in this callback.

### Callback

| Name         | Description                                                    |
| ------------ | -------------------------------------------------------------- |
| `LibraryLog` | Callback that provides the log, including `header` and `data`. |

### Parameters

| Name     | Type   | Description             |
| -------- | ------ | ----------------------- |
| `header` | String | Header of the log file. |
| `data`   | String | Body of the log file.   |