There would have to be some form of description of those goods. There are already means whereby you can track back the information. It would not be that much more expensive if you needed to add on a couple more points. It would need changes put in place globally by the instruction of the international card scheme, VISA, Mastercard who do these things in order to get the information to this end and for us to process it. But it would not be impossible.
Nothing is impossible.
It would be inconvenient but that is all. Helen Southworth 307. I am not quite sure what you mean by on-line debit cards. The kind of thing you were describing before, the little box. They also provides mobility to the card holder.