Use the Discount Function API to create a single discount that applies to cart lines, order subtotal, and shipping rates.

<Notice type="info" title="Migrate your existing discount functions" > To learn how to migrate your existing Discount Functions to use the [Discount API](/docs/api/functions/reference/discount), refer to [Migrate to the Discount API](/docs/apps/build/discounts/mig...

October 29, 2025 - In either case, Shopify needs a record of a discount in the admin that corresponds to your function. The API call typically includes details like the function ID, the title of the discount, the strategy for how it combines with other discounts, etc.

Shopify Functions API - Javascript App for Discount - GitHub - ramdhanishivam/discount-function-app: Shopify Functions API - Javascript App for Discount

This API allows you to create discounts that apply simultaneous savings to products, order totals, and/or shipping costs—a use case historically supported by Shopify Scripts. To learn more about the new Discount Function API, read our developer ...

This approach wasted compute cycles ... improvements have changed this landscape: The Discount API now allows apps to generate product, order, and shipping discounts—all powered by a single Discount Code....

Use the Product Discount Function API to create a new type of discount that's applied to particular product variants or cart lines.

A legacy shipping discount function that applies a discount to a specific shipping method if the delivery address is in a specific city. This example applies a 50% shipping discount to the express shipping method.

Live in the new Discount Function API: Create a single Function that applies product, order, and shipping discounts—all in one API call.

Discounts created by Discount Functions are automatically eligible on different sales channels, including Online Store and POS. Discount Functions can not be excluded from POS. Stores on any plan can use public apps that are distributed through the Shopify App Store and contain functions. Only stores on a Shopify Plus plan can use custom apps that contain Shopify Function APIs.

Use the API to implement custom logic that distributes discounts across items in a cart, with associated data such as buyer identity, discount codes, and metafields. ... You can install a maximum of one Discount Allocator Function on each store.

The Product Discount API can apply amount or percentage-based discounts to individual products or variants, create discounts based on quantity of products, or create logic that provides free products if you buy a certain quantity of a specific product. Your function runs the logic that determines if the discount should be applied.

Target, allowing for the application of discounts on specific cart lines, a use case that has historically only been possible with Shopify Scripts. This update can be used to link discounts to attributed cart lines such as upsell products, free gifts with purchase, or buyer customized products. You can learn more about the Product Discount Function API here.

3 weeks ago - Hi everyone, I am using the latest Discount Function API for my app. I went through the documentation of combining discounts here. It says that multiple discounts can combine based on the combinesWith settings. Here all …

September 12, 2025 - Prior to April 2025, this API was ... straightforward APIs, the Discount Function API allows you to add a new type of discount to all items, where you can expose custom business logic....

It contains information about when the discount began, when it will end, and what it is applied to.

October 10, 2023 - I am using the discount function API to reduce different prices for different products, but only one product is displayed on the shopping cart or checkout with a discount price applied, and other products are not effective. I think the corresponding Discounts type for the API is an array, which means that multiple discount information can be output, but the result only takes effect on one, which is far from what I expected.

App discounts built with the Discount Function API can return operations that use Order and Product discount classes in their CartLinesDiscountsGenerateRunResult and the Shipping class in CartDeliveryOptionsDiscountsGenerateRunResult.