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.
Normally, once the customer used the payment gateways there will be a transaction email sent to them once the payment is completed.
In JotForm, you can create an auto-responder email. So once the customer filled up the form, JotForm will send an email to the customer using the email address on the submission. This auto-responder notification can be customized.
Here's a guide on how to create an auto-responder notification.
If you want to include a invoice type numbers, please use a unique ID field. Please check this guide on how to add custom unique IDs to your form submissions
Hope this helps. Let us know if you need any help.