async getAccessTokenFromCode(authData) {
    const response = await fetch('https://api.instagram.com/oauth/access_token', {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({
        client_id: this.clientId,
        client_secret: this.clientSecret,
        grant_type: 'authorization_code',
        redirect_uri: this.redirectUri,
        code: authData.code
      })
    });

    if (!response.ok) {
      throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Instagram API request failed.');
    }

    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 Instagram.

@class InstagramAdapter
@param {Object} options - The adapter configuration options.
@param {string} options.clientId - Your Instagram App Client ID. Required for secure authentication.
@param {string} options.clientSecret - Your Instagram 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 Instagram authentication, use the following structure:
```json
{
  "auth": {
    "instagram": {
      "clientId": "your-client-id",
      "clientSecret": "your-client-secret"
    }
  }
}
```
### Insecure Configuration (Not Recommended)
```json
{
  "auth": {
    "instagram": {
      "enableInsecureAuth": true
    }
  }
}
```

The adapter requires the following `authData` fields:
- **Secure Authentication**: `code`, `redirect_uri`.
- **Insecure Authentication (Deprecated)**: `id`, `access_token`.

## Auth Payloads
### Secure Authentication Payload
```json
{
  "instagram": {
    "code": "lmn789opq012rst345uvw",
    "redirect_uri": "https://example.com/callback"
  }
}
```

### Insecure Authentication Payload (Deprecated)
```json
{
  "instagram": {
    "id": "1234567",
    "access_token": "AQXNnd2hIT6z9bHFzZz2Kp1ghiMz_RtyuvwXYZ123abc"
  }
}
```

## Notes
- `enableInsecureAuth` is **deprecated** and will be removed in future versions. Use secure authentication with `code` and `redirect_uri`.
- Secure authentication exchanges the `code` and `redirect_uri` provided by the client for an access token using Instagram's OAuth flow.

@see {@link https://developers.facebook.com/docs/instagram-basic-display-api/getting-started Instagram Basic Display API - Getting Started}