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.
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Our standard option is a PayPal tool on form that handles added products and PayPal integration. Please see the next guide.
If the PayPal tool is not flexible enough, you might consider using more advanced setup which allows you to do calculations based on other form fields. Take a look at 'Calculated amount based on user selections and inputs' section of the following article.
Please let us know if you need any further assistance on this. We will be happy to help.