Add Stripe/Similar + Receipt Page to WP Website

Website is [login to view URL] it sells link/access to research software. Currently it is using Paypal and needs to accept credit/debit cards. Ideally, this could have been through WP Simple Pay Lite For Stripe, but some of the plugins the [login to view URL] site currently uses have not been updated, so the site works at WP version 4.4.2 but has problems with collapsible menus at higher versions. Stripe plugin requires 4.7. Request: 1. Add comparable to WP Simple Pay Lite For Stripe solution to existing site. 2. Create a Thank you/Confirmation of Payment page which also captures and sends buyer data so company can send program link to correct buyer email address. Current page template is [login to view URL] - However, not all of this info needs to be on a new form. Form should just capture: email address of user, contact@[login to view URL] email for buyer questions, how did you hear about program, and software piracy Page data is then sent to admin@[login to view URL] to process purchase.