Enabled Payment Experience

- Updated Api to enabled Payment Experience
- Updated Tests and Samples
- Added Json Validator
- Ability for PPModel to return array of self objects

sample/payment-experience/GetWebProfile.php

@@ -0,0 +1,28 @@
+<?php
+
+// ### Get Web Profile
+// If your request is successful, the API returns a web_profile object response that contains the profile details.
+// Documentation available at https://developer.paypal.com/webapps/developer/docs/api/#retrieve-a-web-experience-profile
+
+// We are going to re-use the sample code from CreateWebProfile.php.
+// If you have not visited the sample yet, please visit it before trying GetWebProfile.php
+// The CreateWebProfile.php will create a web profile for us, and return a CreateProfileResponse,
+// that contains the web profile ID.
+/** @var \PayPal\Api\CreateProfileResponse $result */
+$createProfileResponse = require 'CreateWebProfile.php';
+
+try {
+    // If your request is successful, the API returns a web_profile object response that contains the profile details.
+    $webProfile = \PayPal\Api\WebProfile::get($createProfileResponse->getId(), $apiContext);
+} catch (\Exception $ex) {
+    echo "Exception: " . $ex->getMessage() . PHP_EOL;
+    if (is_a($ex, '\PayPal\Exception\PPConnectionException')) {
+        /** @var $ex \PayPal\Exception\PPConnectionException */
+        var_dump($ex->getData());
+    }
+    exit(1);
+}
+
+print_result("Get Web Profile", "Web Profile", $webProfile->getId(), $webProfile);
+
+return $webProfile;