Triggering Zapier on Thank you Page

<script>
var qvars = {};
window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {qvars[key] = value;});
qvars = Object.assign(handl_utm,qvars)
setTimeout(function(){

	var data = new URLSearchParams(qvars).toString()
	console.log(data)
	var xmlHttp = new XMLHttpRequest();
	xmlHttp.open( "GET", 'https://hooks.zapier.com/hooks/catch/5711357/b5af0ju/?'+data, false ); // false for synchronous request
	xmlHttp.send( null );

}, 1000);
</script>