“CHAI is a late comer to Korea’s digital payments market, but we saw a unique opportunity to offer value,” said Shin. The CHAI Card offers merchants a lower transaction fee than other cards and users typically check its app about 20 times to see new cashback offers and other rewards based on how often they pay with their cards or digital wallet.

https://techcrunch.com/2020/12/09/seoul-based-payment-tech-startup-chai-gets-60-million-from-hanhwa-softbank-ventures-asia/