I dont' want to raise any eyebrows around here or anything, but I feel obligated to tell anyone considering purchasing a copy of WHNBilling, please contact me first. I know the site looks professional and makes lots of promises about how great the software is. Trust me, we need to talk. I purchased a license (luckily I went for the lite version to start off with, so I saved a little money anyhow) and I have a whole lot I can tell you that might help you make a wise decision regarding the matter. Just a few of the wonderful features of whnbilling: * invoices that list charges for one total, and charge another total * sales tax that does not take the users state in mind * reseller support that doesnt work and ignores your config * non-cc payment methods that don't work worth a flip * duplicate charges to users credit card with ease! * sending root passwords over plaintext http connections * setup fee cannot be conditional (such as if domain is new) ...and MUCH MUCH MORE! As bad as it is, I have continuously offered to help develop the product further to the level it should be for them to be selling it to other folks, and they refuse. I also can't seem to get any support beyond &our system doesn't do that. you can purchase the full source version and you can fix the problem yourself&, for features that are either inferred to be working properly by their sales pitch on their site, or things that are common sense and should work one way, but instead just decide to half-way implement something just so we can claim it as a feature. A very bad experience nevertheless.