Hi melhorngk -
Customers can now download an Xfinity Home National Alarm Certificate. To do this simply log into your Xfinity.net account & go to My Account > My Services > Xfinity Home > Xfinity Home National Alarm Certificate.
Alternatively, you can go directly to https://customer.xfinity.com/MyServices/XHS & select Xfinity Home National AlarmCertificate.
Please reach out if you have any other questions!