I'm very grateful to Ctrip for making it so convenient to buy international train tickets. I printed out the QR code and brought it with me. I redeemed my ticket at the white machine at the JR entrance of Terminal 1 at Kansai Airport. The machine has a Chinese language option. After redeeming my ticket, I entered the station through the manual channel and took the escalator down one level to Platform 3, which is where the Hello Kitty shuttle bus is located.
The date of use was listed as two days from now, but I was able to make a reservation around 11:30 PM and choose the next date and time, so I think if it's the day before the date, you can make a reservation for the next day~~!! It was my first time purchasing Rapit online,, (I bought the ticket on the spot when I went from Kansai Airport to Namba Station), so I didn't know that I had to scan the QR code and pass through the ticket gate, so I scanned my ICOCA card again and paid double the fare,, but please make sure to scan the QR code and pass through the ticket gate~~!! The staff member said I could get a refund for the ICOCA card I accidentally scanned, but since I was pressed for time, I just rode it to the airportㅜ Anyway, Rapit is super fast and the best!! I definitely recommend riding Rapit!!