For all of those who found this page and tried following the steps to set up Alipay just as I did, some of the steps are meanwhile outdated and the options you need to choose are not there anymore. After a call with the hotline it turns out that meanwhile the website version does not have all the features available in the mobile phone app. Registering using the mobile phone app including bank account verification was very smooth and without problems. Search online for guides setting up Alipay via the app.
We have since also posted an updated step-by-step guide. See that here.