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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
A payment will be marked as incomplete due to several reasons, for example, the user may have closed the payment page before to proceed with the payment, or because of connection issues.
I would suggest you to check this guide about incomplete payments on PayPal forms: https://www.jotform.com/help/272-Paypal-Incomplete-Payments-FAQ
There you will also find some suggestions about how to get notified each time there're successfully payments or incomplete ones.
If you have any question, let us know.