> 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/tossauth/tossauth.isintegrated.md).

# TossAuth.isIntegrated

> Functional API `getIsTossLoginIntegratedService`You can use the same function with this as well.

### Feature description

Checks whether the user has linked Toss Login. It can be used for migrations such as finding existing Toss Login users and converting them to game identifiers.

Toss app Android/iOS `5.237.0` It can be used on versions above. If called in an unsupported version, `UNSUPPORTED_APP_VERSION` an error occurs.

When called from a mini app that does not use Toss Login `"oauth2ClientId configuration is required."` An error occurs in the message.

### Type

```ts
TossAuth.isIntegrated(): Promise<boolean>;
```

**Params**

None

**Response**

If it is linked `true`, otherwise `false`is returned.

### Error code

The error code is the `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. `TossAuth.isIntegrated.isSupported()`Check in advance with `error.message`and, if it occurs, show the user the (update guidance message). |

### Example code

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

const button = document.querySelector("#check-integration-button");

button.addEventListener("click", async () => {
  try {
    const result = await TossAuth.isIntegrated();

    if (result === true) {
      console.log("The user has Toss Login linked.");
    } else {
      console.log("The user does not have Toss Login linked.");
    }
  } catch (error) {
    console.error(error);
  }
});
```


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