async getAccessTokenFromCode(authData) {
    const tokenUrl = 'https://oauth2.googleapis.com/token';
    const response = await fetch(tokenUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
      },
      body: JSON.stringify({
        client_id: this.clientId,
        client_secret: this.clientSecret,
        code: authData.code,
        redirect_uri: authData.redirectUri,
        grant_type: 'authorization_code',
      }),
    });

    if (!response.ok) {
      throw new Parse.Error(
        Parse.Error.VALIDATION_ERROR,
        `Failed to exchange code for token: ${response.statusText}`
      );
    }

    const data = await response.json();
    if (data.error) {
      throw new Parse.Error(
        Parse.Error.OBJECT_NOT_FOUND,
        data.error_description || data.error
      );
    }

    return data.access_token;
  }
Parse Server authentication adapter for Google Play Games Services.

@class GooglePlayGamesServicesAdapter
@param {Object} options - The adapter configuration options.
@param {string} options.clientId - Your Google Play Games Services App Client ID. Required for secure authentication.
@param {string} options.clientSecret - Your Google Play Games Services App Client Secret. Required for secure authentication.
@param {boolean} [options.enableInsecureAuth=false] - **[DEPRECATED]** Enable insecure authentication (not recommended).

@description
## Parse Server Configuration
To configure Parse Server for Google Play Games Services authentication, use the following structure:
```json
{
  "auth": {
    "gpgames": {
      "clientId": "your-client-id",
      "clientSecret": "your-client-secret"
    }
  }
}
```
### Insecure Configuration (Not Recommended)
```json
{
  "auth": {
    "gpgames": {
      "enableInsecureAuth": true
    }
  }
}
```

The adapter requires the following `authData` fields:
- **Secure Authentication**: `code`, `redirect_uri`.
- **Insecure Authentication (Not Recommended)**: `id`, `access_token`.

## Auth Payloads
### Secure Authentication Payload
```json
{
  "gpgames": {
    "code": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "redirect_uri": "https://example.com/callback"
  }
}
```

### Insecure Authentication Payload (Not Recommended)
```json
{
  "gpgames": {
    "id": "123456789",
    "access_token": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  }
}
```

## Notes
- `enableInsecureAuth` is **not recommended** and may be removed in future versions. Use secure authentication with `code` and `redirect_uri`.
- Secure authentication exchanges the `code` provided by the client for an access token using Google Play Games Services' OAuth API.

@see {@link https://developers.google.com/games/services/console/enabling Google Play Games Services Authentication Documentation}