Samples for All Invoice Operations including QR Code

- Invoice search method is static now
- Shipping Info has proper Phone Params
- Small Changes to Image Class
- Updated Sample Docs

sample/invoice/RecordPayment.php

@@ -0,0 +1,39 @@
+<?php
+
+// # Record Payment Sample
+// This sample code demonstrate how you can record
+// an invoice as paid.
+
+/** @var Invoice $invoice */
+$invoice = require 'SendInvoice.php';
+
+use PayPal\Api\Invoice;
+use PayPal\Api\PaymentDetail;
+
+try {
+    // ### Record Object
+    // Create a PaymentDetail object, and fill in the required fields
+    // You can use the new way of injecting json directly to the object.
+    $record = new PaymentDetail(
+        '{
+          "method" : "CASH",
+          "date" : "2014-07-06 03:30:00 PST",
+          "note" : "Cash received."
+        }'
+    );
+
+    // ### Record Payment for Invoice
+    // Record a payment on invoice object by calling the
+    // `recordPayment` method
+    // on the Invoice class by passing a valid
+    // notification object
+    // (See bootstrap.php for more on `ApiContext`)
+    $recordStatus = $invoice->recordPayment($record, $apiContext);
+} catch (Exception $ex) {
+    ResultPrinter::printError("Payment for Invoice", "Invoice", null, $recordStatus, $ex);
+    exit(1);
+}
+
+ResultPrinter::printResult("Payment for Invoice", "Invoice", $invoice->getId(), $record, null);
+
+return $invoice;