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/invoice/CreateInvoice.php

@@ -32,7 +32,7 @@ $invoice
 // A resource representing merchant information that can be
 // used to identify merchant
 $invoice->getMerchantInfo()
-    ->setEmail("PPX.DevNet-facilitator@gmail.com")
+    ->setEmail("jaypatel512-facilitator@hotmail.com")
     ->setFirstName("Dennis")
     ->setLastName("Doctor")
     ->setbusinessName("Medical Professionals, LLC")