Adding a different product with each order for the same product

How can I add a variable product that changes with every order for a fixed product? he can buy the product online, and after the purchase process, I want a message to appear with a picture of the QR code with an activation number. and When the customer enters order page, he finds the QR code and the activation code. I tried to do it with a downloadable product, but the link changes with… Every purchase and it does not appear as a picture. Can someone help me with this? I have a programming background


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