How is the application sent to the mail in the SaleJS jquery cart?

Question

JavaScript

Good afternoon. I found a script salejs.com/ru.html to create a simple "online store" on LP, all the functionality is fine, but I just don't understand how the application is sent to the mail, if you connect store.js from the developer's site, as it is written in the documentation, the application comes , and if you connect it from your server, then an error pops up. there is a small manual (video manual 9 min) , but I don’t understand where the orders directory comes from and how to make the request go from my server and not the salejs.com server