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Almost a decade ago Alipay experimented with this https://techcrunch.com/2013/04/14/alipay-launches-sound-wave-mobile-payments-system-in-beijing-subway/ https:/

by eunos 4y ago

Almost a decade ago Alipay experimented with this https://techcrunch.com/2013/04/14/alipay-launches-sound-wave-mobile-payments-system-in-beijing-subway/ https://techcrunch.com/2013/04/14/alipay-launches-sound-wave... Seems going nowhere