cmc-sales/php/app/views/documents/pdf_po.ctp

<?php
// Generate the Purchase Order PDF by calling the Go service instead of TCPDF/FPDI.

$goBaseUrl = AppController::getGoBaseUrlOrFail();
$goEndpoint = $goBaseUrl . '/go/pdf/generate-po';

$outputDir = Configure::read('pdf_directory');

$lineItems = array();
foreach ($document['LineItem'] as $li) {
    $lineItems[] = array(
        'item_number' => $li['item_number'],
        'quantity' => $li['quantity'],
        'title' => $li['title'],
        'unit_price' => floatval($li['gross_unit_price']),
        'total_price' => floatval($li['gross_price'])
    );
}

$payload = array(
    'document_id' => intval($document['Document']['id']),
    'title' => $document['PurchaseOrder']['title'],
    'principle_name' => isset($principle['Principle']['name']) ? $principle['Principle']['name'] : $document['PurchaseOrder']['ordered_from'],
    'principle_reference' => $document['PurchaseOrder']['principle_reference'],
    'issue_date' => $document['PurchaseOrder']['issue_date'],
    'ordered_from' => $document['PurchaseOrder']['ordered_from'],
    'dispatch_by' => $document['PurchaseOrder']['dispatch_by'],
    'deliver_to' => $document['PurchaseOrder']['deliver_to'],
    'shipping_instructions' => $document['PurchaseOrder']['shipping_instructions'],
    'currency_symbol' => $currencySymbol,
    'show_gst' => (bool)$gst,
    'line_items' => $lineItems,
    'output_dir' => $outputDir
);

$ch = curl_init($goEndpoint);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));

$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$curlErr = curl_error($ch);
curl_close($ch);

if ($httpCode < 200 || $httpCode >= 300) {
    echo "<p>Failed to generate PO PDF via Go service (HTTP $httpCode).";
    if ($curlErr) {
        echo " Error: $curlErr";
    }
    echo "</p>";
    exit;
}
?>

<script type="text/javascript">
    window.location.replace("/documents/view/<?=$document['Document']['id']?>");
</script>