@JCS if you just finished the car reservation, then you shouldn't have any charge yet on that card. The card was used to hold the reservation. When you pick up the car, you'll need to tell the rental car agency you need to change the method of payment.
By chance did you book this car reservation through Concur Travel? I'm asking because you can specify on your Concur profile the card you want to use as the default for Car Reservations. This avoids the exact situation you encountered. 🙂
Let me know if I can help any further.
Thank you,
Kevin Dorsey
SAP Concur Community Manager
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