Port javascript form + PHP to other website (Wordpress) - repost

I have a form (in Prestashop) that I need transferred to my new site (WordPress, EDD). It consists of 3 files, JS, CSS & PHP. The data from the form: - is sent to a PHP file - that PHP file generates an XML file - the XML file is added as a unique product to a shopping cart - the XML file is saved in a 'downloads' folder with a unique name & timestamp - after payment an email is sent to the person who filled in the form - in the email is a link to the XML file that was created. All of the above is already coded and working, but was designed to work in Prestashop by a Freelancer on this site. I would like it to work with Wordpress (I will be using Easy Digital Downloads). From what I can see not a huge deal of work needs put in, although the code could do with some refactoring as it's not really legible and some of the logic is rather tricky to understand. I can provide you with a link to the working form, as well as the actual files if you are interested in this project. Thanks