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Originally Posted by dezzo
I can't recall the exact way it was handled for bookings with multiple tickets. Suffice to say it wasn't quite as simple as just popping a card number into a credit card machine and waiting for an auth code.
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Sometimes it is - depends entirely how your backend processing is done
Were these different entities separately charging the customer's card? that would make it much harder to implement.
My experience was in card processing of Internet transactions at a major credit card issuer/processor, so not quite the same as your scenario.
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Originally Posted by dezzo
The problem only occurred with a tiny, tiny minority of the tickets issued and there was no pattern to the double charges.
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Harder to spot a pattern if there's few enough of them. Add to that timing issues and you'd need a good steady stream to find that pattern.