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/GenerateAccessTokenFromRefreshToken.php

@@ -0,0 +1,22 @@
+<?php
+
+// ### Obtain Access Token From Refresh Token
+
+require __DIR__ . '/../bootstrap.php';
+use PayPal\Auth\Openid\PPOpenIdTokeninfo;
+
+// You can retrieve the refresh token by executing ObtainUserConsent.php and store the refresh token
+$refreshToken = 'yzX4AkmMyBKR4on7vB5he-tDu38s24Zy-kTibhSuqA8kTdy0Yinxj7NpAyULx0bxqC5G8dbXOt0aVMlMmtpiVmSzhcjVZhYDM7WUQLC9KpaXGBHyltJPkLLQkXE';
+
+try {
+
+    $tokenInfo = new PPOpenIdTokeninfo();
+    $tokenInfo = $tokenInfo->createFromRefreshToken(array('refresh_token' => $refreshToken), $apiContext);
+
+} catch (PayPal\Exception\PPConnectionException $ex) {
+    echo "Exception: " . $ex->getMessage() . PHP_EOL;
+    var_dump($ex->getData());
+    exit(1);
+}
+
+print_result("Obtained Access Token From Refresh Token", "Access Token", $tokenInfo->getAccessToken(), $tokenInfo);