To use QRadar integration in n8n, start by adding the HTTP Request node to your workflow canvas and authenticate it using a predefined credential type. This allows you to perform custom operations, without additional authentication setup. Once connected, you can make custom API calls to QRadar to query the data you need using the URLs you provide, for example: you can create operations like adding offenses by sending a POST request to the relevant QRadar API endpoint with the necessary payload. For instance, to update a specific offense, use a PATCH request along with the offense ID in the URL, including the fields that need modification in the request body. Additionally, you can retrieve offense data by making a GET request to the appropriate endpoint to fetch current records or statistics.