Does the cancellation button requirement also apply to contracts with fixed term and one-time payment?

Yes, and this has been clarified conclusively by the Federal Court of Justice ruling from May 2025. What matters is not how payment is made, but how the service is delivered. If a customer pays a one-time fixed amount for a yearly subscription, the actual service still runs over twelve months — and that alone is enough for the contract to qualify as an ongoing contractual relationship under § 312k BGB. Providers who have relied on a one-time payment exempting them from the requirement should review their contract models. Courts now examine the actual contract structure closely, not the label or billing method.