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A comment on Ask HN: I bought Voltaren at the chemist, now Google shows me ads for it. Why?. Parent comment

Re:Ask HN: I bought Voltaren at the chemist, now Google show... by barbazoo on Sunday April 18, 2021 @11:44AM (#26853412)
I might be naive but I don't see how the CC company would have the list of items you purchased.
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Re:Ask HN: I bought Voltaren at the chemist, now Google show... by tpxl on Sunday April 18, 2021 @12:26PM (#26853823)
Technically the system is designed such that the CC company knows nothing of the receipt and the merchant knows nothing of the buyer.

If you're using a store card, the merchant == the CC company and so knows everything about you anyways.

If you're not using the store card, the merchant probably has an agreement with the CC company to share the information, so the technical implementation is irrelevant.

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