Mobile has become an expected method of payment irrespective of the geographical
location or the level of technology adoption across the developed and developing countries.
The differences of adoption rates between China and Japan are significant, warranting further
research into the barriers to mobile payment. To fill this research gap, we propose and
empirically test a theoretical model of mobile payment adoption by users in China, Taiwan,
and Japan. A decision-tree method was used to analyse 726 questionnaire responses. The results
reveal that innovators, early adopters, and the early majority categories are concerned about
the performance risk of mobile payment adoption and innovators, early adopters, and the late
majority categories are concerned about the security risk of mobile payment adoption. The
findings will help 5G mobile services vendors develop consumer trust and increase the
contributions of the mobile industry to GDP.