
Defaults are 1194 for UDP and 443 for TCP.VPN_ENDPOINT_PORT: Custom OpenVPN server endpoint port to use.FREE_ONLY: Filter only free tier servers by setting it to on.SERVER_HOSTNAMES: Comma separated list of server hostnames.SERVER_CITIES: Comma separated list of cities.SERVER_REGIONS: Comma separated list of regions.SERVER_COUNTRIES: Comma separated list of countries.OPENVPN_USER is your OPENVPN specific username.

Note however you cannot filter servers as easily as with OpenVPN since each server uses its own private key and/or peer address. 💁 To use with Wireguard, download a configuration file from here and head to Wireguard#Custom-setup.
