M4 Manufacturer Discount or Surcharge

M4 Manufacturer Discount or Surcharge is a PrestaShop module that enables store administrators to configure price adjustments — discounts or surcharges — for every combination of product manufacturer (brand) and customer group. This allows merchants to create brand-specific pricing rules targeted at particular customer segments without relying solely on PrestaShop's built-in discount mechanisms.

Key features and behaviours of this module:

• Manufacturer and customer group matrix: Define individual discount or surcharge percentages or amounts for any pairing of manufacturer and customer group, using the customer's default group as the basis for calculation.
• Price chain integration: The module operates as a distinct step in PrestaShop's price calculation chain, applying adjustments after catalog prices, quantity discounts, and group reductions have been computed.
• Specific price override: Discounts set in this module take precedence over any specific prices defined on individual products — specific prices are ignored for products covered by a module rule.

Important compatibility notes: the module is not compatible with PrestaShop's built-in ecotax, should not be combined with other M4 Discount modules simultaneously, and built-in group discounts should not be used alongside it to avoid pricing conflicts.

This module is well suited for PrestaShop store owners who need to offer differentiated pricing by brand and customer group — for example, applying distributor-level discounts to all products from a specific manufacturer for a wholesale customer group.