README

Per-item discount messages and strikethrough pricing for Magento 2 carts.

Features

• Strikethrough pricing — regular catalog price crossed out next to the discounted price on cart line items
• Discount exclusion messages — explains why an item was excluded from a coupon or why only a partial discount was applied
• Coupon discount messages — shows the coupon discount amount per item
• Affiliate discount messages — shows affiliate-specific discount amounts (requires Amasty Affiliate)
• Cart drawer support — adds price data to customer section data for FPC-compatible cart drawers
• GraphQL support — extends CartItemPrices with regular_price, has_discount, and discount_messages fields
• Multi-store — all features configurable per store view
• Translations — included for en_US, de_DE, it_IT, fr_FR, es_ES

Requirements

• PHP 8.3+
• Magento 2.4.7+
• pixelperfectat/magento2-module-discount-exclusion

Optional

• Hyvä Theme — required for cart page strikethrough pricing template
• Amasty Affiliate — enables affiliate discount detection and messaging

Installation

composer require pixelperfectat/magento2-module-checkout-discount-display
bin/magento module:enable PixelPerfect_CheckoutDiscountDisplay
bin/magento setup:upgrade

Configuration

Stores > Configuration > Sales > Checkout Discount Display > General

Both settings are configurable at the default, website, and store view level.

GraphQL

The module extends the CartItemPrices type:

{
  cart(cart_id: "...") {
    items {
      prices {
        regular_price {
          value
          currency
        }
        has_discount
        discount_messages
      }
    }
  }
}

How It Works

1. An observer on sales_quote_collect_totals_after iterates visible cart items and attaches discount messages via AbstractItem::addMessage()
2. Messages are recalculated on every collectTotals() call — no persistent storage needed
3. A plugin on Magento\Checkout\CustomerData\AbstractItem::getItemData() adds regular_price, regular_price_formatted, and has_discount to section data for the cart drawer
4. The Hyvä template override renders strikethrough pricing when the regular price differs from the final price

License

MIT