With cookie stuffing, the process can be as follows:
- User visits some website (not the affiliate or merchant).
- User receives cookie identifying affiliate.
- User visits merchant site and buys something.
- Merchant sees affiliate cookie and sends them a commission.
In this second scenario, the affiliate was paid even though the user never visited their site.
From reading the PDF of the complaint, I think it's more like this, which is subtly different:
- User visits affiliate's website (or one they supplied code for)
- User doesn't click on (or necessarily even see) a link to the merchant, but gets a cookie identifying the affiliate anyway, as if they did.
- Some time in the next month, user visits merchant site and buys something.
- Merchant sees affiliate cookie and sends them a commission.
The cookie should only be there if the affiliate was responsible for the user visiting the merchant's web site.
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