- Deprecate cart.discountAllocations and cartDiscountAllocation.discountApplication; use cart.discountApplications and sourceDiscountApplication for correct values
- Add new fields like cart.discountApplications, sourceDiscountApplication, totalAllocatedAmount, and deliveryGroups[].discountAllocations; introduce lineLevelOnly argument on cart.lines[].discountAllocations
- Update queries to replace deprecated fields, adjust allocation queries, and verify discount calculations across percentage, fixed, and free shipping discounts