More Webhook API Changes

- Updated API Models with Fixes
- Updated Samples
- Additional Functional Tests

sample/notifications/DeleteWebhook.php

@@ -0,0 +1,25 @@
+<?php
+
+// # Delete Webhook Sample
+//
+// This sample code demonstrate how to use this call to search for all webhook events., as documented here at:
+// https://developer.paypal.com/docs/api/#delete-a-webhook
+// API used: DELETE v1/notifications/webhooks/<Webhook-Id>
+
+// ## Get Webhook Instance
+
+/** @var \PayPal\Api\Webhook $webhook */
+$webhook = require 'CreateWebhook.php';
+
+
+// ### Delete Webhook
+try {
+    $output = $webhook->delete($apiContext);
+} catch (Exception $ex) {
+    ResultPrinter::printError("Delete a Webhook", "Webhook", null, $webhookId, $ex);
+    exit(1);
+}
+
+ResultPrinter::printResult("Delete a Webhook", "Webhook", $webhook->getId(), null, null);
+
+return $output;