This module let's you apply quantity discounts to categories. This way the customers will have the discounted prices based on the total quantity of products in the selected categories.
This Prestashop module let's you add fees & discounts based on the payment method chosen. You can choose to add an extra fee to any payment method, or give a discount to encourage the usage of one.
This is a standalone affiliates module for prestashop. you don't have to subscribe to a third party service or install any other software.