Want to parse XML but need to login?

I'm trying to write a PHP that will parse the XML data of meeting attendance, but I can't access that data without logging in. How can I use API to access and parse this data, is there a way to pass my credentials in? I'm using this service to get the XML: Adobe Connect Help | report-meeting-attendance

I've tried first doing get request to http://alu.adobeconnect.com/api/xml?action=login&login=username&password=password​ but that doesn't work.