Enabled Vault Credit Card List API

- Added Credit Card List API Operation
- Updated Credit Card to include new properties
- Updated Tests
- Updated Samples
- Fixed Billing Agreement Sample (Expired Set Date).

sample/index.php

@@ -879,6 +879,17 @@ if (PHP_SAPI == 'cli') {
                             </div>
                         </div>
                     </li>
+                    <li class="list-group-item">
+                        <div class="row">
+                            <div class="col-md-8"><h5>Credit Card - List All</h5></div>
+                            <div class="col-md-4">
+                                <a href="vault/ListCreditCards.php" class="btn btn-primary pull-left execute"> Try It <i
+                                        class="fa fa-play-circle-o"></i></a>
+                                <a href="doc/vault/ListCreditCards.html" class="btn btn-default pull-right">Source <i
+                                        class="fa fa-file-code-o"></i></a>
+                            </div>
+                        </div>
+                    </li>
                     <li class="list-group-item">
                         <div class="row">
                             <div class="col-md-8"><h5>Credit Card - Update</h5></div>