Update: We found the failure and the shop is working again.
Sadly, the technical Problems are back. This time there are problems in the bookshop presumably due to rooting problems of the provider. If you want to order a book you can do so by sending a mail to “post @ hefe-und-mehr.de”. I update this post when we fixed the problem!
I’m very sorry for any inconvenience.
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FYI: Routing!=Rooting 😉