Shopify Order Function Discounts Applying to Subtotal Instead of Product Variants

[Jonathan-Shopify]

@Shrutika_Lokhande

• If offerType is “cart”, discount applies to the order subtotal.
• If offerType is “all-products”, it should apply to product variants (row-level).

This is exactly what the new Discount Function API is for, to let you have a single function that can generate a mix of line-level and order-level discounts. The legacy Order Discount Function API is only able to generate order-level discounts, as indicated by its name.