There was a posting to this affect about a month or so ago.  Suggest 
searching of the archives.

--Brian

YvesDM wrote:
> Hi,
>
> Sorry, this will be slightly off topic, but I know there are many people
> here who are into hotspot business etc.
> so I ask the question here. I have hotspot setups with radius backend and
> I'm looking for an easy way to create vouchers.
> What (software, script,...) do you guys use to create vouchers? Or does
> everyone just have them printed for them?
> All suggestions are welcome.
>
> Kind Regards,
> Yves
>