> 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 the function-style API as well. The function-style 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

It gives the user a reward (Toss Points) using a promotion code.

Toss app **5.232.0** can be used on versions above. Before calling, `Promotion.grantReward.isSupported()`You can check support with it. If called in 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 point amount to award. */
  amount: number;
}
```

**Response**

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

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

### Error

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

| Code                      | Description                                                                                                                                                                                                                                 |
| ------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `UNSUPPORTED_APP_VERSION` | If the running Toss app version does not support this feature, it occurs immediately upon calling. `Promotion.grantReward.isSupported()`Check in advance with, and if it occurs `error.message`show the user the (update guidance message). |
| `4100`                    | This is the case when the promotion information cannot be found.                                                                                                                                                                            |
| `4104`                    | This is the case when the promotion is suspended.                                                                                                                                                                                           |
| `4105`                    | This is the case when the promotion has ended.                                                                                                                                                                                              |
| `4108`                    | This is the case when the promotion is not approved.                                                                                                                                                                                        |
| `4109`                    | This is the case when the promotion is not running.                                                                                                                                                                                         |
| `4110`                    | This is the case when rewards cannot be granted/reclaimed.                                                                                                                                                                                  |
| `4112`                    | This is the case when the promotion money is insufficient.                                                                                                                                                                                  |
| `4113`                    | This is the case when it has already been granted/reclaimed.                                                                                                                                                                                |
| `4114`                    | This is the case when the one-time grant amount set for the promotion is exceeded.                                                                                                                                                          |
| `UNKNOWN_ERROR`           | This is the case when an unknown error occurs.                                                                                                                                                                                              |

Functional API `grantPromotionReward`is, like v2, not rejected and instead returns a failure `{ errorCode: string; message: string }` value or `'ERROR'` 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 awarded successfully!", result.key);
  } catch (error) {
    console.error("Failed to award points:", error.code, error.message);
  }
}

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


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