Showing item-level & order-level offers/promotions on Details page (PDP) &/or Cart page?

I have 2 types of offers (promotions) applicable on my eCommerce website:

  • Item level offers (example: Item belongs to Brand XYZ. Buy any 2 items from brand XYZ to get 30% off)
  • Order level offers (example: $10 off on total purchase of $100 worth of items)

Journey of user will be: User will go to the Details page of an item, User will see all the item-level offers applicable to the item, user will add the item to the cart, user will come to the Cart page.

Assumption: The user has added 5-6 items in the Cart page, and each of these items has 2-3 item-level offers associated with it, and there are 2-3 order-level offers applicable too.

Question is:

  • Where should I list the item-level offers associated with the item?
  • Where should I list the order-level offers?

Possible options:

  • Showing item-level offers only on Details page
  • Showing item-level offers only on Cart page
  • Showing order-level offers only on Details page
  • Showing order-level offers only on Cart page
  • Showing item-level offers only on both Details page & Cart page
  • Showing order-level offers only on both Details page & Cart page