Enhanced discounts support in the Shopify Functions Cart

As of GraphQL API version 2026-04, Shopify Functions can now access detailed discount information at three levels:

1. Cart-level: All discount applications on the cart.
2. Line item-level: Discounts allocated to specific line items.
3. Delivery-level: Discounts allocated to delivery groups.

Based on the function execution order, only functions that execute after discounts can see complete discount information.

Learn more about function inputs.