>>Mel
>>
>>If this had happened to me, in the future I'd put a time-bomb in the code that can only be deactivated by a code you send him, once you get payment.
>
>That could get you in trouble - a timebomb yes - but make it look like a random-technical crash!

No, you've all got me wrong - I meant a time-out sort of thing, that would stop the system working if the client doesn't pay up, just like certain Windows apps won't work after a while if you don't register online.

But thanks for the felonious tip!