For six decades, shoppers at Mikawaya, a rice dealer in eastern Tokyo, paid in cash ¡ª until sales staff from payments app PayPay swept through the low-lying district, persuading the store to give their product a try.

With customers clamoring to use the service and nearby stores signing up, PayPay¡¯s offer of free installation and no handling fees was too good to refuse, the store¡¯s owners say.

¡°We thought there could be no harm in trying it out,¡± said Moeko Suzuki, who helps her father run the store, standing amid sacks of rice. ¡°The number of young people has really increased.¡±