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

## Extension targets

The Order Discount API exposes the following [targets](/docs/apps/build/app-extensions/configure-app-extensions#targets):

| Target | Output type | Description |
| ------ | ----------- | ----------- |
| `purchase.order-discount.run` | [FunctionRunResult](#functionrunresult) | Outputs the order-level discount that should be applied to the cart |

## Input

The `RunInput` object is the complete schema that your function can receive as [input](/docs/apps/build/functions/input-output#input).


For a list of fields that the Order Discount API's `Input` object accepts, refer to [Input](/docs/api/functions/reference/order-discounts/graphql/input).

### Example

The following example shows an input query:


<p>
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</div>
</div>

<script data-option="filename" data-value="input.graphql"></script>

<script type="text/plain" data-language="graphql">
query Input {
  cart {
    lines {
      id
      merchandise {
        id
      }
    }
  }
}
</script>

</div>
</p>


The following example shows the resulting input to the query:


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</div>

</div>
</div>

<script data-option="filename" data-value="input.json"></script>

<script type="text/plain" data-language="json">
{
  "cart": {
    "lines": [
      {
        "id": "gid://shopify/CartLine/0",
        "merchandise": {
          "id": "gid://shopify/ProductVariant/0"
          }
      },
      {
        "id": "gid://shopify/CartLine/1",
        "merchandise": {
          "id": "gid://shopify/ProductVariant/1"
        }
      }
    ]
  }
}
</script>

</div>
</p>


## FunctionRunResult

The [`FunctionRunResult`](/docs/api/functions/reference/order-discounts/graphql/functionrunresult) object is the expected [output](/docs/apps/build/functions/input-output#output) for the `purchase.order-discount.run` target.

### Example

The following function result includes one discount of 10% off the order subtotal amount:

<p>
<div class="react-code-block" data-preset="file">
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<div class="react-code-block-preload-bar "></div>
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</div>
</div>

<script data-option="filename" data-value="output.json"></script>

<script type="text/plain" data-language="json">
{
  "discountApplicationStrategy": "FIRST",
  "discounts": [
    {
      "value": {
        "percentage": {
          "value": "10.0"
        }
      },
      "targets": [
        {
          "orderSubtotal": {
            "excludedVariantIds": [
            ]
          }
        }
      ],
      "message": "10% off"
    }
  ]
}
</script>

</div>
</p>