Is there a way to tell what credit card number was used to hold an eUp request? I haven't had a co-pay in ages so I can't remember how it works, and I've had an upgrade request clear at my clearance window but I think the credit card that I used for the hold at the time of the request is now cancelled (was compromised). Will they have tried to charge the card already when the eUp was processed or does that take place after the flight?