How do I embed a chatbot widget on my website using JavaScript?

<!-- BEGIN COPY / PASTE -->
    <!-- Include the chatbot script in your HTML -->
    <script src="https://example.com/chatbot.js"></script>

    <!-- Initialize the chatbot widget -->
    <script>
      window.onload = function() {
        Chatbot.init({
          selector: '#chatbot',
          apiKey: 'YOUR_API_KEY',
          welcomeMessage: 'Hello! How can I help you today?'
        });
      };
    </script>

    <!-- Add a div where the chatbot will be rendered -->
    <div id="chatbot"></div>
    <!-- END COPY / PASTE -->