Say I purchase a laptop from Amazon/Walmart/any big box store. I assume they note down the unique identifier for the device and link it to the purchase, which has my credit card information.

How would Ebay do this? I’m curious about the extent of information that the marketplace giants have of consumers purchasing electronics from them. Cheap Chinese gizmos might not have unique identifiers but a Dell Laptop certainly has a few.

I’m sure some here can imagine the technical reason for the question. Have a good day ahead!