While we do not specifically support PFSense and can't guarantee that VyprVPN will work on that system, we have heard of customers being able to connect to VyprVPN using the OpenVPN Client in PFSense.
If you intend to attempt to set up a connection to VyprVPN on PFSense, you will likely need our OpenVPN files and CA cert, which can be found in the .zip files here.
If you need any further assistance, please contact our 24/7 Customer Success Team, who would be glad to assist.