Installing HostBill
HostBill installation is fully automated and takes just seconds, more info at Installation
Setup guide
You will need to set up Web SDK integration in Duo administration interface to obtains integration key, secret key, and API hostname, which you will have to provide while setting up Duo Security module in HostBill.
Double check your integration while setting it up in HostBill, if you don't provide valid details you may get locked out from your admin area. If that happens your only option is to remove this plugin
Integration works with DuoSecurity's free and paid accounts