sermonindex
Starting this summer, the government will test a system in which foreign tourists will be able to verify their identities and buy things at stores using only their fingerprints.
The government hopes to increase the number of foreign tourists by using the system to prevent crime and relieve users from the necessity of carrying cash or credit cards. It aims to realize the system by the 2020 Tokyo Olympic and Paralympic Games.
http://the-japan-news.com/news/article/0002859676
People already do this on their iPhones and laptops. Wider use is coming.