OpenVPN PAM Authentication

Hi,
i want to enable my OpenVpn for an extra authentication before establishing a Client Connection.
I think about something like this:
https://forums.openvpn.net/viewtopic.php?t=17899
But for this PAM Authentication the function or the plugin seems missing...
Can somebody help or forward this to the development guys?

Thanks
Michael

I found a solution for that in the last post from this link i mentioned:


It's a simple solution for a OpenVPN user authentication and works as expected.