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/lipp/ObtainUserConsent.php

@@ -0,0 +1,22 @@
+<?php
+
+require __DIR__ . '/../bootstrap.php';
+
+use PayPal\Auth\Openid\PPOpenIdSession;
+
+$baseUrl = getBaseUrl() . '/UserConsentRedirect.php?success=true';
+
+// ### Get User Consent URL
+// The clientId is stored in the bootstrap file
+
+//Get Authorization URL returns the redirect URL that could be used to get user's consent
+$redirectUrl = PPOpenIdSession::getAuthorizationUrl(
+    $baseUrl,
+    array('profile', 'email', 'phone'),
+    null,
+    null,
+    null,
+    $apiContext
+);
+
+print_result("Generated the User Consent URL", "URL", null, '<a href="'. $redirectUrl . '" >Click Here to Obtain User Consent</a>');