As far as I know no it won’t. But I guess you can try but if it breaks don’t blame me and please don’t ask for support.
Email me at sgrayban[at]gmail.com and I’ll send you a copy.
It should. The full API is available in Virtualmin GPL as of 3.66. So, only the features unique to Virtualmin Professional are different in the APIs…it’d be almost impossible to make a tool that used the API without it being compatible with both GPL and Professional.
Joe is this module being promoted somewhere on your sites?
The more users, the more development might be done to get it from great to perfect.
I’ve added WHMCS to the billing app question in the FAQ. I’ll make sure there’s more/better coverage on the new website.
I found the link at http://www.virtualmin.com/faq/cat/virtualmin/68/#faq59 to WHMCS.
What version of WHMCS does or will ship with Vmin support?
WHMCS.com doesn’t list Vmin on the front page yet.
Is there a URL where we can download this billing module?
Thanks,
K
Actually a week ago I asked in a TT at WHMCS and they said that the Virtualmin Integration will be available in WHMCS in some months later.
Do you think this can be something of the next release?
Some of the folks that have this mentioned that it’s a beta version at the moment – they had to contact the company to get a copy.
If you’re interested in it, that might be the best route, to just contact the company and ask.
-Eric
Please do contact them (politely). We want them to know they’ve made a great choice in supporting Virtualmin. 
They want your business, and they’re great folks, so I suspect they’ll be happy to hear from you.
What’s the best vehicle for doing that, Joe?
If either the Vmin team or the WHMCS team can create an email list of interested parties, that would be really cool.
If you put a little survey with the signup, we could maybe show the WHMCS team something about the Vmin market.
One survey question might be whether we users are looking to Beta test or are looking for a Stable release. Personally, I am looking for Stable.
Or maybe a survey on the Forum here…just so Matt doesn’t have dozens of individual emails to respond to.
Thanks for facilitating this relationship. More Billing system integration is better.
K
The best way is to contact Matt of WHMCS. For instance through sales[at]whmcs.com
I could attach the module here but that would go beyond the point of letting the WHMCS guys know about interested parties.
The module works fine.
But to go stable you’ll need to go through a period of testing time. The module is in production on my server and I believe on SGrayban’s server as well.
There is a version2 of the module but that one isn’t near finished. For now the existing version works.
It’s being tested on one other server so that’s 3 so far.
I contacted Matt and I got the module from him.
I will start testing tomorrow on a VirtualMin GPL. 
I’ve just requested whmcs send me the beta module for virtualmin integration.
Hello,
We are very interested in using whmcs, and we would like to integrate it into our site seamlessly, has anyone had any luck with this, and if so any pointers would be much appreciated. We have created an account with whmcs and got a demo lic, but would rather deploy and get moving if workable.
Thanks in advance for your time on this!
Dlion
the version 4 of whmcs has the new virtualmin module installed by default. Also a module for namecheap (domain registration)
to integrate it into your site. whmcs works with smarty template (.tpl) so you can change/replace the header/footer section and shouldn’t be all too hard to integrate it.
there are other examples in whmcs forum, some even integrated it with a joomla! install
Where might I find this module to configure after successful install of version 4?
I see so mention of VM Pro in the list of CPs to configure. Is there something else I need to do?
@dandlion: If you set up your Server as Virtualmin, and then create products which are Virtualmin, it should work, as long as you take care to set which event you want to trigger the Virtual Server creation - the order, the payment, or your acceptance of the order.
It’s just a little confusing, but once you get it- looking back, it’s not that bad.
K