# useApplyDiscountCodeChange

Returns a function to add or remove discount codes.

> Caution:
> See [security considerations](https://shopify.dev/docs/api/checkout-ui-extensions/configuration#network-access) if your extension retrieves discount codes through a network call.

## 

### UseApplyDiscountCodeChangeGeneratedType

Returns a function to add or remove discount codes.

> Caution:
> See [security considerations](https://shopify.dev/docs/api/checkout-ui-extensions/configuration#network-access) if your extension retrieves discount codes through a network call.

#### Returns: (change: DiscountCodeChange) => Promise<DiscountCodeChangeResult>
export function useApplyDiscountCodeChange<
  ID extends RenderExtensionPoint = RenderExtensionPoint,
>(): (change: DiscountCodeChange) => Promise<DiscountCodeChangeResult> {
  const api = useApi<ID>();

  if ('applyDiscountCodeChange' in api) {
    return api.applyDiscountCodeChange;
  }

  throw new ExtensionHasNoMethodError(
    'applyDiscountCodeChange',
    api.extensionPoint,
  );
}


### DiscountCodeAddChange

### type

value: `"addDiscountCode"`

The type of the `DiscountCodeChange` API.

### code

value: `string`

The code for the discount

### DiscountCodeRemoveChange

### type

value: `"removeDiscountCode"`

The type of the `DiscountCodeChange` API.

### code

value: `string`

The code for the discount

### DiscountCodeChangeResultSuccess

### type

value: `"success"`

Indicates that the discount code change was applied successfully.

### DiscountCodeChangeResultError

### type

value: `"error"`

Indicates that the discount code change failed.

### message

value: `string`

A message that explains the error. This message is useful for debugging.
It is **not** localized, and therefore should not be presented directly
to the buyer.

## Related

- [StandardApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/standardapi)
- [CheckoutApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/checkoutapi)
- [OrderStatusApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/orderstatusapi)
- [CartLineDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/cartlinedetailsapi)
- [PickupPointsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuppointsapi)
- [PickupLocationsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuplocationsapi)
- [ShippingMethodDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/shippingmethoddetailsapi)
- [ExtensionPoints](https://shopify.dev/docs/api/checkout-ui-extensions/apis/extensionpoints)