The Order Discount API enables you to create a new type of discount that is applied to all merchandise in the cart.


> Deprecated:
> In version 2025-04, the Order Discount API's are deprecated in favour of the [Discount API](/docs/api/functions/reference/discount) and will be sunset in version 2026-04. Learn how to [migrate your Functions to the Discount API](/docs/api/functions/reference/discount/migrate-from-legacy-discount-apis).


## Example use cases

- Money off the order subtotal. For example, $5 off the order subtotal.
- Money off products on an order. For example, 20% off all products on the order.
- Tiered discount by spend. For example, spend $100 get 10% off all products.

## Developer tools and resources

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      Shopify CLI
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    <p class="resource-card__description">A command-line tool for building Shopify apps.</p>
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      Order Discount API reference
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    <p class="resource-card__description">Consult the GraphQL reference for the Order Discount API.</p>
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## Migrating from scripts to functions


If you want to migrate an existing [line item script](https://help.shopify.com/manual/checkout-settings/script-editor/shopify-scripts) to Shopify Functions, then you can use the following mappings:

| Shopify Scripts method | Description | Shopify Functions object | Additional context |
|------------------------|-------------|--------------------------|-------------------|
| `change_line_price` | Applies a discount to a cart line such as a loyalty discount on a product by specifying a new reduced price, and a message either set by the developer or the merchant in the Function's configuration. | [Discount](/docs/api/functions/reference/discount/graphql/cartlinesdiscountsgeneraterunresult) | Apply [order discounts](/docs/api/functions/reference/discount/graphql/common-objects/orderdiscountcandidatetarget) or [product discounts](/docs/api/functions/reference/discount/graphql/common-objects/productdiscountcandidatetarget) by specifying the [OrderDiscountCandidateValue](/docs/api/functions/reference/discount/graphql/common-objects/orderdiscountcandidatevalue) or [ProductDiscountCandidateValue](/docs/api/functions/reference/discount/graphql/common-objects/productdiscountcandidatevalue) (`percentage` or `fixedAmount` off), and an optional message. |
| `split` | Splits a product into multiple lines so that you can apply discounts to partial quantities. For example, if a customer has five t-shirts in their cart, you can apply a discount to only two items while keeping the other three at full price | [Discount](/docs/api/functions/reference/discount/graphql/cartlinesdiscountsgeneraterunresult) | Use the optional `quantity` field in the [`ProductDiscountCandidateTarget`](/docs/api/functions/reference/discount/graphql/common-objects/productdiscountcandidatetarget) object to limit the number of units the discount may be applied to. |
| `change_properties` | Adds or changes a line item property | Not available | Refer to [applyAttributeChange](/docs/api/checkout-ui-extensions/latest/apis) in the checkout UI extensions API to apply attribute changes. |
| `reject` | Disallows a discounts code from being applied at checkout | Not available | Use a [Discount](/docs/api/functions/reference/discount/graphql/cartlinesdiscountsgeneraterunresult) function that contains the necessary logic. For example, you can use conditions to exclude a discount from applying, such as preventing a discount code when cart value is below $50 or when specific products are in the cart.  |




## Limitations and considerations

- Input `cart.deliveryGroups` is always an empty array for this function.
- Active automatic app discounts using Shopify Functions are applicable for all [Shopify sales channels](https://help.shopify.com/manual/online-sales-channels) that use Shopify Checkout, including the [Online Store](https://help.shopify.com/manual/online-store) and [Shopify Point Of Sale (POS)](https://help.shopify.com/manual/sell-in-person).


## Next steps

- Learn how to create discount apps that use [Shopify Discount Functions](/docs/apps/build/discounts).