System outage disrupts credit card payments across Japan

Major Japanese credit card issuers Mitsubishi UFJ NICOS and Sumitomo Mitsui Card experienced a system outage on 16 July, disrupting card payments at merchants nationwide and blocking transit app transactions via credit card functions. Root cause remains under investigation. Japan's payment infrastructure just failed at scale during business hours - two of the country's largest card networks went down simultaneously. If you're building redundancy, failover, or alternative payment rails into Japanese commerce or transit, you now have a concrete proof-of-concept that the current system can't absorb a single point of failure.