Button to check youtube subscription status for my Channel

I am trying to create a button. When someone clicks it will check the status of the user for a youtube channel subscription. I you want to check the subscription status of the user who is clicking the button for my youtube channel.

Using following JS Code:

function checkSubscriptionStatus() {  var channelID = 'your_channel_id';  var APIKey = 'your_api_key';  // Get user's Google account ID from YouTube API  gapi.client.load('youtube', 'v3', function() {    gapi.client.youtube.channels.list({      mine: true,      part: 'id'    }).then(function(response) {      var userID = response.result.items[0].id;      // Use the YouTube Data API to retrieve subscription status      var url = 'https://www.googleapis.com/youtube/v3/subscriptions';      url += '?part=status&channelId='+ channelID +'&subscriberId='+ userID +'&key='+ APIKey;      // Send API request      fetch(url)        .then(response => response.json())        .then(data => {          // Check if the user is subscribed          var isSubscribed = data.items[0].status.subscribed;          if (isSubscribed) {            // User is subscribed, show message or do something else            console.log('User is subscribed');          } else {            // User is not subscribed, show message or do something else            console.log('User is not subscribed');          }        })        .catch(error => {          console.error('Error checking subscription status', error);        });    });  });}

But I am getting following error in my console:

error loading GAPI client for API

Note: I have already included following code in my header file as I adding this button in a WordPress website

<script src="https://apis.google.com/js/api.js"></script><script>  function initClient() {    gapi.client.init({      apiKey: 'YOUR_API_KEY',      discoveryDocs: ['https://www.googleapis.com/discovery/v1/apis/youtube/v3/rest'],    });  }  gapi.load('client', initClient);</script>

Would love to have some help from the community.