CSR-1391 click x on afterpay modal sends user back to payment-method

src/layouts/payment/payment.vue

@@ -360,6 +360,7 @@ export default {
         next(async (vm) => {
             vm.setCmsContent(resultMap.cmsContent);
             vm.fetchSignatureInfo(resultMap.signature);
+            vm.setIFrameListener();
 
             vm.availableVaps = taxedVaps;
             vm.lineItems = lineItems;
@@ -577,6 +578,16 @@ export default {
 
             this.submitHopForm();
         },
+        handleIFrameContentWindwMessage(event) {
+            if (event.data.indexOf("afterpayClosed") > -1) {
+                this.backButtonAction();
+            }
+        },
+        setIFrameListener() {
+            window.addEventListener("message", (event) =>
+                this.handleIFrameContentWindwMessage(event)
+            );
+        },
     },
     components: {
         funnelHeader,