How to debug the automatic sending of a link to the product to the buyer?

Question

CRM

In general, there is an electronic goods store (books, pictures, music, etc.). The payment procedure is as follows:
1. The user selects a product, and it is sent to the shopping cart.
2. From the shopping cart, the user places an order and selects a convenient form of payment (WebMonay, Yandex.Money, debit cards, offline, etc.). In the same place, he drives in the email address to which the link to the archive should come.
3. After payment, the order receives the status "Completed", and the link is sent to the buyer by mail, leading to the archive of a specific product selected by the buyer. The link should be valid only ONCE after the archive is sent to the user's computer. If you try to download the file again, the link will not open and will become invalid.
Tell me, please, how to do this? I have a payment system with a change in the status of the goods, but automatic sending is not debugged, that is, I have to do everything manually, sending an encrypted archive with a password. This method is not very secure, since the buyer can transfer the archive password to someone else. So I decided to post links. Are there any modules that make this process easier?

Answer 1

What is the point of a one time link? The buyer, when he receives the archive with a password, can distribute it further and upload it to free access and with a one-time link