Hey guys, I had the same question regarding credit card info. I'll paste the Support's reply:
"Unfortunately, we're unable to modify billing information at this time.
If the system is unable to collect the remaining funds from the original credit card, you will receive an email stating that your order is pending payment.
At that time, you can add another payment method before the order is processed.
Please note that there will not be a delay in sending you the Rift, if you update your payment method immediately.
Sorry for the inconvenience,
Kelly
Oculus VR Support"
"Unfortunately, we're unable to modify billing information at this time.
If the system is unable to collect the remaining funds from the original credit card, you will receive an email stating that your order is pending payment.
At that time, you can add another payment method before the order is processed.
Please note that there will not be a delay in sending you the Rift, if you update your payment method immediately.
Sorry for the inconvenience,
Kelly
Oculus VR Support"