Highway Bus Online Ticket

I asked my Japanese friend to buy our tickets from Shinjuku to Kawaguchiko and back through Highway Bus and he paid it through his credit card.

He only gave us the email confirmation. He told us to just present it at when we board the bus.

Can we go to the ticketing window and ask to make a real bus ticket?

Thanks

No.

So I just need to present the email payment confirmation when I board the bus?

Thanks

Yes.

Thank you so much!