How to open access to a virtual product through a database?

Question

WordPress

Good day!

I need to add individual users access to virtual goods, bypassing the creation of a new order, etc. I turned over the whole database, but I still did not understand how the product is assigned to the user. I thought that the user (or buyer) id is simply added to the product id via meta data. But it turns out that this is not the case.

Who faced, prompt, please.
Thanks in advance!