Simple Bitquery API not working

This file does not appear to return/display data on my page. I do have my API key in here, but removed it for example.

<!doctype html>
<html>
<head>
<meta charset="utf-8">
	<title>Bitquery</title>
    <meta name="description" content="Bitquery" />
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1" /></head>

    <body>
	<h2><a href="/">Back to Home</a></h2>
	<h2>Bitquery Examples</h2>
	
  <h2>Simple Bitquery API in App Script</h2>
  
  <script>
    
    function GET_TOKEN_TEST(token) {
      const query = `
      query{
      bitcoin{
        blocks{
          count
        }
       }
    }
    `;
    const url = "https://graphql.bitquery.io/";
    const opts = {
        method: "POST",
        headers: {
            "Content-Type": "application/json",
            "X-API-KEY": "myAPIkeyHERE"
        },
        payload: JSON.stringify({
            query
        })
    };
    var response = UrlFetchApp.fetch(url, opts)
    var w = JSON.parse(response.getContentText());
    console.log(w)
    }
</script>
		
</body>
</html>

For me, it’s saying UrlFetchApp not defined.