Trying to SE this new cool device for my home. If all goes well, I will share the deets here. They are asking to have a credit card on file in case I do not return my unit within 30 days. I have some prepaid cards laying around with low balance. Should I use that or a VCC? Where's the best place for a free VCC Once I don't return item, they will attempt to charge but will be unable to, then what happens? Thanks!