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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Your question lack a bit more of details, so I am not able to fully understand what the complete requirements are.
But base on what I understand so far, you must meant how the form respondent will be able to have receipts/invoice or confirmation after they have completed the payment transaction in your form http://www.jotform.ca/form/41731557183254
You can try using Freshbooks Integration which was the most commonly used for such purpose.
OR for simpler confirmation, you can add Autoresponder Email to your form.
Check the user guide -Creating-a-Form-Autoresponder
Hope this help. Inform us if you need further assistance.