Hi, it might be a long shot, but
I would really love to have the option to be able to accept or decline every transaction, which means if Amazon tries to get money from my card a message would appear on the phone and with my touch id or pin code I could say YES or NO to the transaction. in this case It could not happen that a, somebody could steal from your card b, and unwanted transaction would go through.
So basically every transaction would be delayed… I would love to have this feature
of course you could set to accept every transaction right away, or whitelisted shops… lots of good ideas