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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 lotsofpulp on Sunday April 18, 2021 @09:17AM (#26852166)
Some merchants do transmit information about the purchased items:

https://paymentdepot.com/blog/level-3-data-processing/

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