Enabled Billing Plans and Agreements APIs

- Added API Classes, Samples, and Tests
- Updated Functional Tests
- Updated Documentation with new SDK Name
- Updated Few Samples to use newer nicer result page

sample/payment-experience/ListWebProfiles.php

@@ -23,6 +23,6 @@ foreach ($list as $object) {
     $result .= $object->toJSON(128) . PHP_EOL;
 }
 
-print_result("Get List of All Web Profiles", "Web Profiles", null, $result);
+ResultPrinter::printResult("Get List of All Web Profiles", "Web Profiles", null, null, $result);
 
 return $list;