State for login

in this script what do I need to change to make it work for subscribers only?

> <?php
> 
> $client_id = '';
> 
> $client_secret = '';
> 
> $redirect_uri = '';
> 
> $broadcaster_id = '';
> 
> if (isset($_GET['code']) && $_GET['code']) {
> 
>     $token_url = "https://id.twitch.tv/oauth2/token";
> 
>     $data = array(
> 
>         'client_id' => $client_id,
> 
>         'client_secret' => $client_secret,
> 
>         'grant_type' => 'authorization_code',
> 
>         'redirect_uri' => $redirect_uri,
> 
>         'code' => $_GET['code']
> 
>     );
> 
>     $curl = curl_init($token_url);
> 
>     curl_setopt($curl, CURLOPT_POST, true);
> 
>     curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
> 
>     curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
> 
>     curl_setopt($curl, CURLOPT_TIMEOUT, 1000);
> 
>     $result = curl_exec($curl);
> 
>     $i      = curl_getinfo($curl);
> 
>     curl_close($curl);
> 
>     if ($i['http_code'] == 200) {
> 
>         $result = json_decode($result, true);
> 
>         $curl = curl_init('https://api.twitch.tv/helix/subscriptions?broadcaster_id=' . $broadcaster_id . '&user_id' . $user_id);
> 
>         curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
> 
>         curl_setopt($curl, CURLOPT_HTTPHEADER, array(
> 
>             'Client-ID: ' . $client_id,
> 
>             'Authorization: Bearer ' . $broadcasters_token
> 
>         ));
> 
>         curl_setopt($curl, CURLOPT_TIMEOUT, 1000);
> 
>         $subdata = curl_exec($curl);
> 
>         $i    = curl_getinfo($curl);
> 
>         curl_close($curl);
> 
>         if ($i['http_code'] == 200) {
> 
>             $user = json_decode($user);
> 
>             echo '<p>Thanks ' . $user->data[0]->display_name . ' <3</p>';
> 
>         } else {
> 
>             echo '<p>An error occured, please <a href="/index.php">click here and try again</a></p>';
> 
>         }
> 
>     } else {
> 
>         echo '<p>An error occured, please <a href="/index.php">click here and try again</a></p>';
> 
>     }
> 
> } else {
> 
>     $auth_url = 'https://api.twitch.tv/kraken/oauth2/authorize?response_type=code';
> 
>     $auth_url .= '&client_id=' . $client_id;
> 
>     $auth_url .= '&redirect_uri=' . $redirect_uri;
> 
>     $auth_url .= '&scope=user_read';
> 
>     $auth_url .= '&force_verify=true';
> 
>     echo '<a href="' . $auth_url . '">Please Click this Link to Authenticate with Twitch</a>';
> 
> }