To use Qualys 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 Qualys to query the data you need using the URLs you provide, for example: you can retrieve vulnerability data by making a GET request to the Qualys API endpoint for vulnerabilities, providing the necessary parameters in the request URL. For instance, use the /api/2.0/fo/vulnerability/ endpoint to pull detailed vulnerability information for specific assets. Additionally, if you need to update asset records, you can use the POST method on the /api/2.0/fo/asset/ endpoint, supplying the required payload in your request body.