Custom Discount Function Applies as “Product, Order & Shipping” Instead of Just “Product”

Extensions
1

I’ve built a custom Shopify Function to apply product-specific discounts using a function extension. It works correctly at the line-item level.

However, when I create a discount using my app, the resulting discount in the Shopify Admin appears with “Types: Product, Order & Shipping” instead of just “Product.” This is problematic because:

  • Even though my function only targets product-level discounts,
  • Shopify’s discount engine treats it as being eligible to override order discounts, since only one discount class is applied per checkout (e.g. product or order or shipping).
  • This results in my product discount canceling out an actual order-level discount, even though they should be stackable under Shopify’s rules. If I make order discounts stackable then people can apply 3 or 4 and get the products for free.

What’s confusing is that I don’t get the option to restrict the discount type during discount creation via my app. I also can’t find any documentation or UI to specify the applicable discount class as only Product.

What I’ve tried:

  • My function uses productDiscountsAdd with selectionStrategy: ProductDiscountSelectionStrategy.Maximum
  • The logic itself only operates on cart.lines
  • I added a UI extension, but the Admin doesn’t prompt for discount class or type selection during the creation flow.

My question:

How can I ensure that a discount created through my app using a function extension is classified strictly as a Productdiscount, so it doesn’t interfere with Order or Shipping discounts?

Thanks in advance for any insights!

2

Managed to get rid of shipping but cant seem to get rid of orders. Got rid of shipping by removing all references to shipping but there seems to be a few more order references in the generated files do these files matter? as far as Shopify typing my discount?

genFiles
genFiles892×1188 151 KB

if it helps here are my toml files:
Function:
api_version = “2025-04”

[[extensions]]
name = “discount”
handle = “discount”
type = “function”

description = “Discount for target product.”

[[extensions.targeting]]
target = “cart.lines.discounts.generate.run”
input_query = “src/cart_lines_discounts_generate_run.graphql”
export = “cart-lines-discounts-generate-run”

[extensions.build]
command = “”
path = “dist/extension.js”

[extensions.ui]
enable_create = true
handle = “discount-ui”

UI:
api_version = “2024-10”

[[extensions]]

name = “t:name”
description = “t:description”
handle = “discount-ui”
type = “ui_extension”

[[extensions.targeting]]
module = “./src/DiscountFunctionSettings.js”

(./src/DiscountFunctionSettings.js)
target = “admin.discount-details.function-settings.render”

most of the online references and Ais seem to think the issue is in the ui code so I have added my ui code too:
import {
FunctionSettings,
Text,
BlockStack,
extension,
} from ‘@shopify/ui-extensions/admin’;

const TARGET = ‘admin.discount-details.function-settings.render’;

export default extension(TARGET, (root) => {
const title = root.createComponent(
Text,
{ size: ‘medium’, emphasis: ‘bold’ },
‘Discount Configuration’
);

const info = root.createComponent(
Text,
{},
‘This discount applies to products only.’ //LIE =, please help make it true
);

const settings = root.createComponent(FunctionSettings, {
discountClass: ‘product’,
});

const stack = root.createComponent(BlockStack, {}, title, info);

settings.append(stack);
root.append(settings);
});