Ich bin am verzweifeln

 notificationHelper.registerServiceWorker('/sw.js');
function urlBase64ToUint8Array(base64String) {
        const padding = '='.repeat((4 - (base64String.length % 4)) % 4);
        const base64 = (base64String + padding)
            .replace(/\-/g, '+')
            .replace(/_/g, '/');

        const rawData = window.atob(base64);
        const outputArray = new Uint8Array(rawData.length);
        for (let i = 0; i < rawData.length; ++i) {
            outputArray[i] = rawData.charCodeAt(i);
        }
        return outputArray;
    }
    var notificationHelper = {
        isSupported() {
            if (!window.Notification) {
                return false;
            }
            if (!('serviceWorker' in navigator)) return false;
            return 'PushManager' in window;
        },
        urlBase64ToUint8Array(base64String) {
            const padding = '='.repeat((4 - base64String.length % 4) % 4);
            const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/');
            const rawData = window.atob(base64);
            const outputArray = new Uint8Array(rawData.length);
            for (let i = 0; i < rawData.length; ++i) {
                outputArray[i] = rawData.charCodeAt(i);
            }
            return outputArray;
        },
        createNotificationSubscription(pushServerPublicKey) {
            return navigator.serviceWorker.ready.then(function(serviceWorker) {
                return serviceWorker.pushManager
                    .subscribe({
                        userVisibleOnly: true,
                        applicationServerKey: urlBase64ToUint8Array(pushServerPublicKey)
                    })
                    .then(function(pushSubscription) {
                        var subJSObject = JSON.parse(JSON.stringify(pushSubscription));
                        var subscription = {
                            'endpoint': subJSObject.endpoint,
                            'authToken': subJSObject.keys.auth,
                            'publicKey': subJSObject.keys.p256dh,
                            'contentEncoding': 'aesgcm'
                        }
                        return subscription;
                    });
            });
        },
        registerServiceWorker(file) {
            if (!navigator.serviceWorker) return;
            navigator.serviceWorker.register(file);
        }
    }
    function request_permission() {
        Notification.requestPermission(function (status) {
            if (status === 'granted') {
                notificationHelper.createNotificationSubscription("<?php echo htmlspecialchars($key_public); ?>").then(function (subscription) {
                    console.log(subscription);
                    fetch('/push', {
                        method: 'POST',
                        headers: {
                            'Content-Type': 'application/x-www-form-urlencoded',
                        },
                        body: 'data=' + encodeURIComponent(JSON.stringify(subscription)),
                    });
                });
            } else {
                console.log(status);
                setTimeout(request_permission, 5000);
            }
        });
    }
    request_permission();

 $key_public = "BOwepYjLEZEMN0YPlh1NJOr4keeVYEta6mSq4GHX22Uiml9_768M-sHMJpljNRbui7r7C5APr2yjmiwTs3LlcLg";
$key_private = "O7i8vFrZ7HUaNYAl2Wv7Ds8_Gu2pUg-bD8Ddftuy5lc";

 $auth = [
        'VAPID' => [
            'subject' => 'https://lanparty2023.de',
            'publicKey' => $key_public,
            'privateKey' => $key_private
        ]
    ];
    $payload = [
        "title" => "Neue Nachricht von ".$_POST["name"],
        "body" => $_POST["text"] ?? "",
        "badge" => "/image.jpg",
        "icon" => "/favicon.ico",
        "image" => "https://lanparty2023.de/image.jpg",
        "tag" => "Programmierer Lanparty",
        "actions" => [
            [
                "action" => "open",
                "title" => "Nachricht lesen"
            ],
            [
                "action" => "open",
                "title" => "Antworten"
            ]
        ],
        "data" => [
            "open" => "/invite/",
            "default" => "/invite/"
        ],
        "vibrate" => [300, 100, 400]
    ];
$webPush = new \Minishlink\WebPush\WebPush($auth);
$has = array();
    foreach($pushTokens as $data){
        if(isset($has[json_encode($data)])) continue;
        $has[json_encode($data)] = true;
      
$subscription = \Minishlink\WebPush\Subscription::create($data);

$result = $webPush->sendNotification(
    $subscription,
    $payload
    );
echo $result;
    exit();