Here you’ll find a list of all my articles around WireGuard with OPNsense!
https://www.routerperformance.net/opnsense-wireguard-plugin-azirevpn/
https://www.routerperformance.net/opnsense-wireguard-as-a-central-gateway-for-vpn-clients/
Here you can find another guide from the community
https://forum.opnsense.org/index.php?topic=11737.0
And there’s another guide (17.11.2019):
https://blog.linuxserver.io/2019/11/16/setting-up-wireguard-on-opnsense-android/
And here is another guide, very detailed
https://homenetworkguy.com/how-to/configure-wireguard-opnsense/
And the next one from the forums:
https://forum.opnsense.org/index.php?topic=17519.0
Another one in german:
https://www.ja-ki.eu/2019/02/19/wireguard-vpn-mit-opnsense-und-tunsafe/
Forum post
https://forum.opnsense.org/index.php?topic=18239.0
Mullvad in Forum
https://forum.opnsense.org/index.php?topic=15105.msg89260#msg89260