Hello,

   I do not understand why you are worried about duplicate tickets.  All the trouble transactions are seemingly flagged as pending in your database.  All those transactions that are pending and paid for are each issues.  It seems like one would sort by date and time and then cross refer the zipzap refund requests to ensure you do not pay people that requested refunds.  Then you should process what is left?  I'm not trying to be a jerk, but it would be nice to email back the auctioneer and tell them I can send the bitcoins I paid for.