How to auto-sell digital goods on a landing page?

Question

Electronic commerce

Hey!
If a landing page with the sale of digital goods .
With the help of what payment system or what script can you organize the sale of goods according to the scheme Paid-Received the goods by mail.
Each product is unique, so there is no redirect to a page with the same download for everyone.
I've dealt with this sale before.
Payment was via PayPal, after payment, an archive with a template immediately arrived in the mail.

Answer 1

If each product is unique, then the processing is manual.
In general, any online store or billing. You can also order an inexpensive script on freelance.

Answer 2

maybe just connect some gumroad? designers actively use