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.
You can check this guide on how to make a basic order form using our payment integrations (like Paypal): http://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form
To make sure that you won't encounter any problems, please do check if your IPN in your Paypal account is enabled. You can refer to this guide: http://www.jotform.com/help/276-How-to-Enable-IPN-for-Paypal
Do let us know if you need more help on this.