[byoung2]

I think it is a great idea but difficult to implement. There are the privacy concerns, e.g. "I paid in cash to remain anonymous, so why would I give you an email address?" or "Hmmm, the credit card company used to only know the amount I paid and the store, now they can get a list of exactly what I bought". And then there are millions of cash registers out there that are not connected to the internet, and are not upgradable to add new software.