[mv] Duplicate CyberCash transactions IDs?

["Reuven M. Lerner" <reuven@lerner.co.il>]

******    message to minivend-users from "Reuven M. Lerner" <reuven@lerner.co.il>     ******

We're having intermittent problems with CyberCash, and recently
decided to write an auto-mail system, which e-mails us details about
the failure when they occur.

One particularly puzzling error seems to have occurred several days
ago, when a user tried to make a purchase via credit card.  It seems
that CyberCash received a transaction ID, which went through (and was
duly reported in both error.log and tracking.asc).

However, MiniVend didn't stop there.  From everything we can tell
(including the CyberCash Level 2 support people), MiniVend then sent
*another* transaction, with the same transaction ID.  CyberCash
rejected this second request, saying (correctly) that the ID had
already been used.

The user got an error page (which generated the auto-mail to us), got
frustrated, and made an identical purchase.  

While I wish that I could blame this on CyberCash, I'm increasingly of
the opinion that MiniVend sent a duplicate ID.  Has anyone encountered
this before?  Is it possible that the user might have done something
(e.g., press "stop") at the wrong time, thus causing such a problem?

Thanks for any information people can provide...

Reuven
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