> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/api-and-sdk-en/sdk/domains-api/promotion/promotion.grantreward.md).

# Promotion.grantReward

> Functional API `grantPromotionReward`You can use the same functionality with this as well. The function-based API is the same as v2 `{ params: { promotionCode, amount } }` It takes an argument in the form of, and if the app version is unsupported, instead of an error `undefined`is returned.

### Feature description

Use a promotion code to give the user a reward (Toss points).

Toss app **5.232.0** You can use it on version and above. Before calling, `Promotion.grantReward.isSupported()`You can check support status with Promotion.grantReward.isSupported(). If you call it on an unsupported version, `UNSUPPORTED_APP_VERSION` an error occurs.

### Type

```ts
Promotion.grantReward(params: { promotionCode: string; amount: number }): Promise<GrantPromotionRewardResponse>;
```

**Params**

```ts
{
  /** This is the promotion code. */
  promotionCode: string;
  /** This is the amount of points to grant. */
  amount: number;
}
```

**Response**

```ts
type GrantPromotionRewardResponse = {
  /** This is the reward key. */
  key: string;
};
```

* `{ key: string }`: Points were granted successfully. `key`is the reward key.

### Error

If granting points fails, an error containing a failure code is thrown. The error code is the caught error's `error.code` value.

| Code                      | Description                                                                                                                                                                                                                                     |
| ------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `UNSUPPORTED_APP_VERSION` | If the running version of the Toss app doesn't support this feature, it occurs immediately upon call. `Promotion.grantReward.isSupported()`Check in advance with `error.message`and, if it occurs, show the user the (update guidance message). |
| `4100`                    | This is when the promotion information can't be found.                                                                                                                                                                                          |
| `4104`                    | This is when the promotion has been paused.                                                                                                                                                                                                     |
| `4105`                    | This is when the promotion has ended.                                                                                                                                                                                                           |
| `4108`                    | This is when the promotion hasn't been approved.                                                                                                                                                                                                |
| `4109`                    | This is when the promotion isn't running.                                                                                                                                                                                                       |
| `4110`                    | This is when the reward can't be granted/reclaimed.                                                                                                                                                                                             |
| `4112`                    | This is when there isn't enough promotion money.                                                                                                                                                                                                |
| `4113`                    | This is when it has already been granted/reclaimed.                                                                                                                                                                                             |
| `4114`                    | This is when it exceeds the one-time grant amount set for the promotion.                                                                                                                                                                        |
| `UNKNOWN_ERROR`           | This is when an unknown error has occurred.                                                                                                                                                                                                     |

Functional API `grantPromotionReward`Like v2, it does not reject and returns failure `{ errorCode: string; message: string }` value or `'ERROR'` It returns as a string.

### Example code

```js
import { Promotion } from "@apps-in-toss/web-framework";

async function handleGrantReward() {
  try {
    if (!Promotion.grantReward.isSupported()) {
      console.warn("This app version is not supported.");
      return;
    }

    const result = await Promotion.grantReward({
      promotionCode: "PROMOTION_CODE",
      amount: 1000,
    });

    console.log("Points granted successfully!", result.key);
  } catch (error) {
    console.error("Failed to grant points:", error.code, error.message);
  }
}

document
  .querySelector("#grant-reward")
  .addEventListener("click", handleGrantReward);
```


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