More Invoice API Updates

sample/invoice/RetrieveQRCode.php

@@ -0,0 +1,41 @@
+<?php
+
+// # Retrieve QR Code for Invoice Sample
+// Specify an invoice ID to get a QR code (image) that corresponds to the invoice ID. A QR code for an invoice can be added to a paper or PDF invoice. When a customer uses their mobile device to scan the QR code, the customer is redirected to the PayPal mobile payment flow, where they can pay online with PayPal or a credit card.
+
+/** @var Invoice $invoice */
+$invoice = require 'SendInvoice.php';
+
+use PayPal\Api\Invoice;
+use PayPal\Api\Notification;
+
+try {
+
+    // ### Retrieve QR Code of Sent Invoice
+    // Retrieve QR Code of Sent Invoice by calling the
+    // `qrCode` method
+    // on the Invoice class by passing a valid
+    // notification object
+    // (See bootstrap.php for more on `ApiContext`)
+    $image = Invoice::qrCode($invoice->getId(), array('height' => '300', 'width' => '300'), $apiContext);
+
+    // ### Optionally Save to File
+    // This is not a required step. However, if you want to store this image as a file, you can use
+    // 'saveToFile' method with proper file name.
+    // This will save the image as /samples/invoice/images/sample.png
+    $path = $image->saveToFile("images/sample.png");
+
+
+} catch (Exception $ex) {
+    ResultPrinter::printError("Retrieved QR Code for Invoice", "Invoice", $invoice->getId(), null, $ex);
+    exit(1);
+}
+
+ResultPrinter::printResult("Retrieved QR Code for Invoice", "Invoice", $invoice->getId(), null, $image);
+
+// ### Show the Image
+// In PHP, there are many ways to present an images.
+// One of the ways, you could directly inject the base64-encoded string
+// with proper image information in front of it.
+echo '<img src="data:image/png;base64,'. $image->getImageBase64() . '" alt="Invoice QR Code" />';
+