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![A customer uses a kiosk at a food court in a Seoul shopping mall on March 27. [NEWS1]](https://image.koreajoongangdaily.com/12360944.jpg?imageId=12360944&width=240&height=184&format=webp&format=jpg)
![A park ranger greets visitors by collecting entrance fees at the Fall River entrance to Rocky Mountain National Park in Colo., on Sept. 21, 2023. The National Park Service is continuing to convert dozens of its sites across the country to cashless payments only, drawing complaints and, now, a lawsuit. [Stephen Speranza /The New York Times]](https://image.koreajoongangdaily.com/10742397.jpg?imageId=10742397&width=240&height=184&format=webp&format=jpg)
![A sign informing passengers that no cash payments will be accepted is seen on a Seoul city bus. [KANG GAP-SAENG]](https://image.koreajoongangdaily.com/10212859.jpg?imageId=10212859&width=240&height=184&format=webp&format=jpg)