As an alternative to Smart Ex not accepting your cards, has anyone purchased single shinkansen tickets directly from JR WEST website?
https://www.westjr.co.jp/global/en/ticket/overview/
And if I understand correctly, I can then collect the pre-purchased tickets directly at the
JR EAST Travel Service Center at Haneda Airport Terminal 3.
Normally I wouldn't worry too much about purchasing the tickets upon arrival in HND, but this will be my son's first time in Japan and I want to get him a right-side window seat on the Nozomi green car (from Shinagawa to Kyoto). We'll be landing in late May and hoping to board a train around 12pm. Do I even have to worry about not getting the seats I want when purchasing at the Service Center in Haneda?