> 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/iap/iap.createsubscriptionpurchaseorder.md).

# IAP.createSubscriptionPurchaseOrder

### Feature description

Go to the subscription in-app purchase order page. Like one-time purchases `options` / `onEvent` / `onError` It's an event style.

* `options.sku`: This is the subscription product ID.
* `options.offerId`: This is the offer ID to apply. If omitted, the default price is applied.
* `options.processProductGrant`: Called when granting the product after order creation. `{ orderId, subscriptionId? }`It is received.

The returned cleanup function must be called when the feature is finished.

Toss app Android `5.248.0`, iOS `5.249.0` It can be used on versions above. If called in an unsupported version, `UNSUPPORTED_APP_VERSION` an error occurs.

### Type

```ts
IAP.createSubscriptionPurchaseOrder(params: CreateSubscriptionPurchaseOrderOptions): () => void;
```

**Params**

```ts
interface CreateSubscriptionPurchaseOrderOptions {
  options: {
    sku: string;
    offerId?: string | null;
    processProductGrant: (params: {
      orderId: string;
      subscriptionId?: string;
    }) => boolean | Promise<boolean>;
  };
  onEvent: (event: {
    type: "success";
    data: IapCreateSubscriptionPurchaseOrderResult;
  }) => void | Promise<void>;
  onError: (error: unknown) => void | Promise<void>;
}

type IapCreateSubscriptionPurchaseOrderResult =
  IapCreateOneTimePurchaseOrderResult;
```

**Response**

Returns a cleanup function to release resources when the payment flow ends (`() => void`).

### Error

Error codes are `onError`can be received as, or wrapped around the `try/catch`errors caught in `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. `IAP.createSubscriptionPurchaseOrder.isSupported()`Check in advance with `error.message`and, if it occurs, show the user the (update guidance message). |

### Example code

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

const button = document.querySelector("#subscribe-button");
let cleanup;

button.addEventListener("click", () => {
  try {
    cleanup = IAP.createSubscriptionPurchaseOrder({
      options: {
        sku: "premium_monthly",
        offerId: null,
        processProductGrant: ({ orderId, subscriptionId }) => {
          console.log(orderId, subscriptionId);
          return true;
        },
      },
      onEvent: (event) => {
        console.log(event);
      },
      onError: (error) => {
        console.error(error);
      },
    });
  } catch (error) {
    console.error(error);
  }
});

// cleanup?.() when leaving the screen
```


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