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.
Since you'll be dealing with online payment transactions I would suggest though not required that you use an SSL domain for added security to your website.
This would gain trust from visitors since your site is equipped and fully secured to process payments, Also you can embed your form using an SSL version please see this guide on how to achieve this http://www.jotform.com/help/63-How-can-I-receive-SSL-Submissions