JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I understand that you are looking for payment integration with Sofort Banking. Currently this integration is not available with JotForm. However, I'm forwarding your request to our back-end team for consideration to implement this feature. I cannot guarantee that the feature will be implemented or cannot provide you an ETA at the moment. You'll be notified here once we have any update on this feature.