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

sample/bootstrap.php

@@ -23,6 +23,7 @@ use PayPal\Rest\ApiContext;
 use PayPal\Auth\OAuthTokenCredential;
 
 error_reporting(E_ALL);
+ini_set('display_errors', '1');
 
 // Replace these values by entering your own ClientId and Secret by visiting https://developer.paypal.com/webapps/developer/applications/myapps
 $clientId = 'AYSq3RDGsmBLJE-otTkBtM-jBRd1TCQwFf9RGfwddNXWz0uFU9ztymylOhRS';