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Mystery Credit card transaction
First for background.  We use Cybersource and have for a little over a year with no problems and great support.
On 9/22 we did a credit card transaction for a customer, it went through without a hitch.  Next day it was pointed out internally that we had accidentally double charged the shipping.  No big deal, I notified the customer and did a cash refund of the extra amount to his card as a charge back.  That was on 9/23.  
Last night after hours for us, there was a new charge that shows up in Cybersource for precisely the same amount as the refund I had done on 9/23.  This showed up as a sale and used the same reference number from the original cash sale.  However, there is no corresponding transaction in Netsuite.