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/doc/invoice/SendInvoice.html

@@ -9,7 +9,7 @@ a legitimate invoice to the payer</p></div></div><div class="code"><div class="w
 static <code>get</code> method
 on the Invoice class by passing a valid
 Invoice ID
-(See bootstrap.php for more on <code>ApiContext</code>)</p></div></div><div class="code"><div class="wrapper">    <span class="hljs-variable">$invoice</span> = Invoice::get(<span class="hljs-string">"INV2-9DRB-YTHU-2V9Q-7Q24"</span>, <span class="hljs-variable">$apiContext</span>);</div></div></div><div class="segment"><div class="comments "><div class="wrapper"><h3 id="send-invoice">Send Invoice</h3>
+(See bootstrap.php for more on <code>ApiContext</code>)</p></div></div><div class="code"><div class="wrapper">    <span class="hljs-variable">$invoice</span> = Invoice::get(<span class="hljs-string">"INV2-W4LC-6QS9-JZ62-VE4P"</span>, <span class="hljs-variable">$apiContext</span>);</div></div></div><div class="segment"><div class="comments "><div class="wrapper"><h3 id="send-invoice">Send Invoice</h3>
 <p>Send a legitimate invoice to the payer
 with a valid ApiContext (See bootstrap.php for more on <code>ApiContext</code>)</p></div></div><div class="code"><div class="wrapper">    <span class="hljs-variable">$sendStatus</span> = <span class="hljs-variable">$invoice</span>-&gt;send(<span class="hljs-variable">$apiContext</span>);
 } <span class="hljs-keyword">catch</span> (PayPal\<span class="hljs-keyword">Exception</span>\PPConnectionException <span class="hljs-variable">$ex</span>) {