Configuring transmission plugin too run through OpenVPN using PIA with username and password auth

I've read a few posts on how to configure just the transmission plug-in to run through VPN using OpenVPN. There are a couple that get into a detailed description on how to do this, most notably these 2 posts:

1. http://forums.freenas.org/index.php...-a-jail-so-it-only-connects-to-the-vpn.18669/

2. http://joepaetzel.com/2013/09/22/openvpn-on-freenas-9-1/

But neither of them solve my the issue of configuring OpenVPN using a service like...

Configuring transmission plugin too run through OpenVPN using PIA with username and password auth