I want to go to Hakone from Tokyo. I made an online reservation for Oda Express, but I didn't pay for the reservation. How can I pay for the ticket?

if you leave from shinjuku station, you can buy a Hakone pass at shinjuku odaji travel service center. Langman is an express train, so its ticket is: ticket+express ticket. The Hakone Pass only contains bus tickets, so you can only take a regular train. If you have already bought a Hakone Travel Pass, you need to buy an express ticket before you can take the Romance. I checked it online for you. If the reserved express ticket is overdue and has not been paid, it will be cancelled automatically. Generally speaking, when you make an appointment, you should have paid by credit card and reserved your seat. Then you can print out the seat details of the train or store them on your mobile phone. When boarding, you need to have an E-ticket (that is, the page sent to you after the reservation is successful, with the seat number on it)+Credit card (the credit card used when booking)+Free Pass (Hakone Travel Pass or General Bus Pass) to get on the bus. According to your situation, if you haven't paid yet, you should be able to buy a ticket at Oda Express Travel Service Center of Shinjuku Station with the information given to you after the appointment expires.

Hakone Travel Pass can also be bought at Oda Express Travel Service Center of Shinjuku Station on the same day, without purchasing in advance. Attached is the address of the service center: Floor 1, West Exit of Oda Jishinjuku Station (ground floor). Tel: +81-3-5321-7887

I hope I can help you.