Signingup for a payed account

I have been searching for 30 minutes for a link where I can register for a paid account for the app and the website. I have to register again everywhere; website, app, documentation and forum. Bizarre but there is nothing to be found. Even the list with frequently asked questions contain 4 (four) questions. Really?
Do you actually want to get paid?

“Kurviger offers different premium subscriptions. For the Kurviger website there is Kurviger Tourer and for the Android app Kurviger Pro.”

All logins have Google account as an option.