The addition of NETSTARS to the alliance will add 100,000 stores to the network's current 1.6 million merchant partners in Asia.
With the agreement, users of mobile wallets supported by VIA, including Singtel's Dash and AIS Global Pay, will be able to use their respective wallets at merchants including airports, shopping malls, transportation modes and food and beverage outlets.
Users will be able to pay instantly in their local currency with competitive foreign exchange rates in Japan.
NETSTARS aims to grow its merchant base to 1 million stores throughout Japan by the end of next year
As well as Dash and AIS Global Pay, Thailand's Kasikornbank and Malaysia's Boost will soon be adding their mobile wallets to the VIA alliance.
Singtel Group plans to expand the VIA alliance to include other mobile regional associates including Airtel in India, Globe in the Philippines and Telkomsel in Indonesia, as well as more non-telco partners.