Keen IO and Stripe - How to get the total volume of purchases after refunds and declined cards, and convert to dollars (Keen.Metric)

Keen IO and Stripe Revenue Metric Example.js

Keen.onChartsReady(function(){
	// Create a Metric containing our total $ amount in Keen IO credit card transactions (to and from)
	// Excludes: refund transactions from Stripe to card and declined cards
	var myMetric = new Keen.Metric("Stripe_Event", {
		analysisType: "sum",
		targetProperty: "data.object.amount",
		filters: [
			{"property_name":"data.object.captured","operator":"eq","property_value":true},
			{"property_name":"data.object.amount_refunded","operator":"eq","property_value":0}]
	});

	// Create a Metric containing our total number of refunds
	var myMetric2 = new Keen.Metric("Stripe_Event", {
		analysisType: "sum",
		targetProperty: "data.object.amount_refunded",
		filters: [
			{"property_name":"type","operator":"eq","property_value":"charge.refunded"}]
	});

	// Find the difference and convert to dollars
	myMetric.getResponse(function(response){
		firstValue = response.result;
		myMetric2.getResponse(function(nextResponse){
			secondValue = nextResponse.result;
			difference = firstValue-secondValue;
			dollar = difference / 100;
			console.log(dollar);

			//Create a Number visualization for that metric.
			var myNumberVisualization = new Keen.Number(myMetric2, {
				height: "300",
				width: "600",
				prefix:"$",
				label: "Revenue"
				});
			//Draw the visualization in a div
			myNumberVisualization.draw(document.getElementById("myDiv"),
			{"result":dollar});
		});
	});
});