Updates to LIPP & Future Payments

- Updated LIPP Sample code
- Updated Future Payments to have helper functions for retrieving access token
- Updated Logging Syntax to include timestamp and response json

lib/PayPal/Transport/PPRestCall.php

@@ -72,7 +72,6 @@ class PPRestCall
         }
         $connection = new PPHttpConnection($httpConfig, $config);
         $response = $connection->execute($data);
-        $this->logger->fine($response . PHP_EOL);
 
         return $response;
     }