Fixes to Credit Card Update in Vault APIs

- Updated Samples
- Fixes #233

sample/vault/UpdateCreditCard.php

@@ -0,0 +1,51 @@
+<?php
+
+// # Update Credit Card Sample
+// The CreditCard resource allows you to
+// update previously saved CreditCards.
+// API called: PATCH /v1/vault/credit-cards/<Credit-Card-Id>
+// The following code takes you through
+// the process of updating a saved CreditCard
+
+/** @var CreditCard $card */
+$card = require 'CreateCreditCard.php';
+$id = $card->getId();
+
+use PayPal\Api\CreditCard;
+use PayPal\Api\Patch;
+
+// ### Patch Object
+// You could update a credit card by sending patch requests. Each path object would have a specific detail in the object to be updated.
+$pathOperation = new Patch();
+$pathOperation->setOp("replace")
+    ->setPath('/expire_month')
+    ->setValue("12");
+
+// ### Another Patch Object
+// You could set more than one patch while updating a credit card.
+$pathOperation2 = new Patch();
+$pathOperation2->setOp('add')
+    ->setPath('/billing_address')
+    ->setValue(json_decode('{
+            "line1": "111 First Street",
+            "city": "Saratoga",
+            "country_code": "US",
+            "state": "CA",
+            "postal_code": "95070"
+        }'));
+
+$pathRequest = new \PayPal\Api\PatchRequest();
+$pathRequest->addPatch($pathOperation)
+    ->addPatch($pathOperation2);
+/// ### Update Credit Card
+// (See bootstrap.php for more on `ApiContext`)
+try {
+    $card = $card->update($pathRequest, $apiContext);
+} catch (Exception $ex) {
+    ResultPrinter::printError("Updated Credit Card", "Credit Card", $card->getId(), $pathRequest, $ex);
+    exit(1);
+}
+
+ResultPrinter::printResult("Updated Credit Card", "Credit Card", $card->getId(), $pathRequest, $card);
+
+return $card;