JotForm is a completely web based form builder.
It is developed for webmasters with minumum design experience. JotForm has an intiutive drag&drop and instant edit form editor. You can create web forms, collect submissions and payments from your web site visitors. It is very simple. Your users will submit a form and will be redirected to the payment gateway. If you have multiple products, the total amount will be calculated and the user will be asked to pay for it. Once they complete the payment, you will receive an email, and you will be able to see it on the Payment Reports and Logs.