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.
Thank you for contacting us. I also recommend signing up for an account if you haven't yet.
You can use this URL http://www.jotform.com/signup to signup using your email account.
As to your inquiry, the answer is Yes. You can use your form on your non SSL website.
#1 Add the Authorize.net payment tool on your form.
#2 Publish the form on your WP website.
And should be good to go.
Let us know if you need further assistance.