It's my understanding that the credit card itself isn't linked to the Magic Band directly. Your credit card is linked to your room reservation (if you choose to do that). Then, you use the Magic Band to charge to the room - and if you have a credit card set up, the charges go on that way.
I also understand that if you choose to put Disney Gift Cards on your room, you can do that instead of using a credit card.
People had posted on the DIS about worrying about losing their Magic Bands, thinking that people could use the info "stored" on the Magic Bands to charge stuff. It doesn't work that way, luckily. The bands have an RFID chip in them with your My Disney Experience (
MDE) info. That's what lets you scan them and pull up your Fast Passes, your room reservation (for charging), etc. There is no credit card info stored on the actual band itself.
Also, you need a PIN code to charge things to your room, so even if someone has found a Magic Band, they would need the associagted PIN code to charge anything to the room.
Can anyone confirm this? This is what I've read on the DIS - I think it's correct, but would appreciate it if someone could confirm. Thanks!