The Ubercart Discount Coupons module can provide coupon discounts and the Rules module can be used to apply it automatically.
Applying a sale or discount to all products in Drupal's Ubercart
Question
I'd like to temporarily apply a discount, in the form of a percentage, to all of the Products in my Ubercart store. It would be especially helpful, but not necessary, if this could also vary based on a Product's field.
La solution
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