JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I understand that you are looking for IPN settings in PayPal to receive payments from your JotForm. The IPN settings can be found under Profile > Instant Payment Notification preferences in your PayPal dashboard.
Please refer to the following guide that provides you more information on importance of IPN and incomplete payments.
Hope this information helps!