List certs and remove users

[cpa]

We have an intern that left the company. I deleted his user account in the main cloudron admin, but how do I revoke his certs on the VPN app? He cannot access the self-service page anymore he still has openvpn certs or wireguard credentials, right? Are they automatically revoked?

Also, how can I list all the users (people w/ at least one valid cert) of a given vpn (we use several)?

Thanks!