How can I provide direct download links for digital products on Shopify?

[YVS]

Hi, quite new to Shopify. 

Alot of my products will be digitial, and what I am after is.. when a customer buys said item, they get a link to download the file, seen as I will have like 30 products all around 4GB, I don't want to be uploading all them to shopify. I also dont want to let them download directly from Digital Goods as we use Mega, and with that we can revoke the URL if they go against our ToS.

Example: Thanks for purchasing "Example". Here is the download link. "Example.com/file.zip"