The technology is called "osaifu-keitai" (wallet mobile); read it here: http://en.wikipedia.org/wiki/Osaifu_keitai
I had to slide my phone on a scanner to pay for some snacks. It was pretty convenient.
(Sorry for the over-noise of my voice; I need to learn how to edit videos so I can get it to sound right.)
The location was a Lawson convenience store in the Sumiyoshi district of Nagasaki, so in the northern part.
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