You pay based on how far you’re going.
I read somewhere that there are train passes that you can buy. I think one was named Suica or something. You can charge them with money and then you can just ride any bus or train. The cost is charged from that card afterwards. I think you can also add the Suica card to Apple Pay.
Were you using simplelogin.io, which is part of Proton? It is actually possible to reply or send mails from the aliases you create there. The feature is called reverse-alias.