Hi this is my first preordering through Apple.com and I need to use a different payment method than the one that I previously entered. In the FAQ thread it states that when Apple tries to charge you you get a grace period of about 24 hours or so to change your payment method. Can anybody confirm this? I'm also wondering if theres a way for me to change my payment method before this, I would also appreciate if somebody could share how to do so. Thanks for any help!