Button Solution
The order button must clearly read 'order with obligation to pay'.
On the internet, a paid contract only comes into existence if the order button clearly indicates the obligation to pay (for example 'order with obligation to pay'). If it did not, no contract came into existence at all.
The relevant statutes
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General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.