What is JotForm?
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 am not entirely sure what you mean by this, would you mind giving us a bit more details?
If I did understood correctly then you want to send a notification to the user after they made the payment? If so this should already be handled by the payment processor, notifying the user about the purchase details.
Or do you want your visitors to fill one form and get to another form after they make the payment?
Looking forward to your response.