I don't have a pay wave card but notice that with big w and a few other shops forgot which ones, you spend under 30 and you don't need a pin or signature!
The transaction just goes through and this isn't with a pay wave swiper thing
I was quite shocked when that happened but then got use to it, although do question how secure it is.
Dan Murphys also do it, i've had many of my customers get really cranky at me for it.
