CartFixedDiscount

What it does

This helper class handles discount calculations for cart-level fixed amount discount rules in Magento 2.

Developers use it to calculate proportional discount amounts across items, handle shipping discounts, and manage special cases like multi-shipping addresses and tax-inclusive pricing.

It ensures discounts are distributed fairly based on item prices and quantities relative to cart totals.

Public Methods

• calculateShippingAmountWhenAppliedToShipping()
• getDiscountAmount()
• getDiscountedAmountProportionally()
• getShippingDiscountAmount()
• checkMultiShippingQuote()
• getQuoteTotalsForMultiShipping()
• getQuoteTotalsForRegularShipping()
• getBaseRuleTotals()
• getAvailableDiscountAmount()
• applyDiscountOnPricesIncludedTax()