Twitch API after and pagination

API
6 
 $channelsApi21 = 'https://api.twitch.tv/helix/streams?first=100&language=de&game_id=';
 $ch21 = curl_init();

 curl_setopt_array($ch21, array(
    CURLOPT_HTTPHEADER => array(
       'Client-ID: ' . $clientId,
'Authorization: Bearer ' . $keys->access_token
    ),
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_URL => $channelsApi21 . $gameID1
 ));

 $response21 = curl_exec($ch21);

$resp1X = json_decode($response21);
$pageXX = $resp1X->data[0]->pagination;

echo "PAGE: $pageXX";

so far this returns nothing?