In message , at 16:33:14
on Sun, 27 Feb 2011, redcat remarked:

My VISA card has one number, but it's in two separate names -- mine and
Mr Cat's. So wouldn't that confuse the mechanism to have two of the
same card numbers in a row touching the thingie?

This may have been already considered as part of the paywave
specification - for example, is the limit (for non-TfL purchases) ten
per day per card, or ten per day per account (which might have two
cards).
--
Roland Perry