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It is tied to their session ID / shopping cart. They are free to modify the cart and it recalculates the discount.

• graeme 7y ago
  Gotcha. But, if a user wanted to see reviews, they'd have to leave the cart, find the product page, and come back? Or you mean I could link to a product page, and when the product is added to the cart the discount is active?
  • rnotaro 7y ago
    It's probably linked to the session's cookie?