Serialized Downloads

I need to buy some downloads but i need that this downloads are serialized, example:
I sell coupon to get a lunch or dinner, a customer buy the product and then he can download a file.
This file must be an image with a serial number or a qrcode into.
I think in two solution:
1. eshop can generate this special coupon but it need many development
2. i can prepare many different coupons just serialized and upload them in a special folder on server, a folder for each product

This product has a similar feature: www.shopfiles.com/

i hope the joomdonation team read here

Hello Mauro,

EShop supports you to sell downloadable products but it does not the specific features as you ask so I think that you should find another extension from other developers to meet all of your requirements.

Good luck!
Sincerely, Giang