> 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/tosspay/tosspay.authorizesubscription.md).

# TossPay.authorizeSubscription

> Functional API `requestTossPayPaysBilling`You can also use the same functionality. The functional API is the same as v2 `{ params: { wrappedToken } }` It takes an argument in that form, and if it's an unsupported version, it logs a warning instead of throwing an error and then `undefined`is returned.

### Feature description

It opens the Toss Pay subscription payment window and performs user authentication. Once authentication is complete, it returns whether it succeeded.

The actual payment processing must be done separately on the server after authentication succeeds.

Toss app **5.256.0** can be used on versions above. Before calling, `TossPay.authorizeSubscription.isSupported()`You can check support with it. If called in an unsupported version, `UNSUPPORTED_APP_VERSION` an error occurs.

### Type

```ts
TossPay.authorizeSubscription(params: RequestTossPayPaysBillingOptions): Promise<RequestTossPayPaysBillingResult>;
```

**Params**

```ts
type RequestTossPayPaysBillingOptions = {
  /** This is the subscription wrapping token. */
  wrappedToken: string;
};
```

**Response**

```ts
type RequestTossPayPaysBillingResult = {
  /** Whether authentication succeeded. */
  success: boolean;
  /** The reason if authentication failed. */
  reason?: string;
};
```

### Error code

The error code is the `error.code` value.

| Code                      | Description                                                                                                                                                                                                                                         |
| ------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `UNSUPPORTED_APP_VERSION` | If the running Toss app version does not support this feature, it occurs immediately upon calling. `TossPay.authorizeSubscription.isSupported()`Check in advance with, and if it occurs `error.message`show the user the (update guidance message). |

### Example code

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

async function handleBilling() {
  try {
    if (!TossPay.authorizeSubscription.isSupported()) {
      console.log("The current app version does not support subscription payment authentication.");
      return;
    }

    // In a real implementation, replace this with an API endpoint that creates the subscription payment.
    const { wrappedToken } = await fetch("/my-api/billing/create").then((res) =>
      res.json(),
    );

    const { success, reason } = await TossPay.authorizeSubscription({
      wrappedToken,
    });

    if (success) {
      // In a real implementation, replace this with an API endpoint that executes the subscription payment.
      await fetch("/my-api/billing/execute", {
        method: "POST",
        body: JSON.stringify({ wrappedToken }),
        headers: { "Content-Type": "application/json" },
      });
    } else {
      console.log("Authentication failed:", reason);
    }
  } catch (error) {
    console.error("An error occurred during subscription payment authentication:", error);
  }
}

document
  .querySelector("#billing-button")
  .addEventListener("click", handleBilling);
```


---

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