[mv] Duplicate orders?

["Christopher P. Lindsey" <lindsey@mallorn.com>]

******    message to minivend-users from "Christopher P. Lindsey" <lindsey@mallorn.com>     ******

I didn't see much in the archives that answered this...

We've been getting many duplicate orders on the system.  They usually show
up one or two seconds apart and only two make into the system before that
session is cleared, but it's making customers nervous.

The only thing that I can think of is that they're clicking on the 
"Place Order" button multiple times -- there can be a one second delay
while the secure server does its thing (maybe we should have used lower
encryption?), so I can see people clicking on it a couple of times (I've
seen this happen on other Web-based applications for the same reason).

Is there a way to immediately lock the session when a POST is performed 
to the checkout page?  Then, if certain conditions aren't met, the session
could be unlocked.

Thanks for any tips,

Chris
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