Just had a further thought on this... If a system is generating identical invoice numbers for its own internal use, won't this cause problems later if anyone has queries and needs to get in touch and quote these numbers back to BotCon?
When anyone registers for Auto Assembly, I can trace an attendee by their online transaction reference and the ticket number that is allocated to them as soon as they book and their confirmation email telling them of their ticket numbers will be their secondary record of the transation as well as their payment receipt. That gives international attendees added peace of mind that their bookings are safe and not having to worry incase passes don't arrive in time... and we even have contingency plans in place for those eventualities or for late bookings.
Either way though, our system is basic, limited in terms of the technology behind it, but it's worked very well for the last 5 years we have been offering online bookings and so far we have never double-booked any tickets or had confusion over ticket numbers.
I would hope that BotCon has another quick way of identifying bookings from other methods from the online system in the event of queries or the system could cause them a few headaches
Simon
Auto Assembly 2015 - Sumalee Montano, James Horan and more... 21st - 23rd August 2015, Birmingham, England. Europe's biggest Transformers convention... you KNOW it makes sense!!