* the default payment method used by 99% of the sellers requires a German bank account
* most sellers request a German credit score (Schufa)
* many apps are not available in the app stores outside of Germany and of course none is available in a FOSS store
Haven't followed it recently, but I have still to see a success story that someone not residing in Germany has actually bought it successfully.
I think the background is:
* Paypal is not very common/popular in Germany so most local transport agencies don't bother
* with SEPA direct debit which is the common payment in Germany you can easily initiate a chargeback after you have already used the ticket. Of course that's fraud, but if you live abroad, the effort to sue you would be tremendous
So in Germany, can you pay your Paypal bills any other way than by credit card? Honest question, when I lived in Germany the last time, Paypal did not exist yet.
I assume you are talking about https://www.bundesbank.de/de/publikationen/berichte/studien/...
> But the same publication says that only a bit over 50% of the population even own a credit card
Because many cashless transactions are done with girocards. https://en.wikipedia.org/wiki/Girocard
Germans are usually very aware of hidden costs and credit cards are usually more expensive per transaction.
Germans also usually are much less in debt than for example many US citizens - for example the University education costs much much less. Young adults have 1400 Euros (plus!) on their giro account and it is typical to pay from that account.
no SEPA compatible bank account AFIK, that means most EU bank accounts would work
I don't know if they do that anymore?
The closest is now the "Quer-durchs-Land" (~"across the country") ticket which is available for any day of the week and currently costs 44€ for the first person and 7€ each for up to 4 more people travelling on it.
The different providers can differ in what payments they accept and how they send you the ticket. Some also include extra benefits.
According to their website, Mainz, for example seems to sell them in their app and accepts credit card, as well as PayPal payments.