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 * Helper function that returns the generated HTML for the invoice PDFs.
 *
 * @param object[] $orders
 *   Array of order objects.
 */
function commerce_billy_pdf_html($orders) {
  // Backwards compatibilty: also accept a single order object.
  if (is_object($orders)) {
    $orders = array($orders);
  }
  foreach ($orders as $order) {
    $vars['viewed_orders'][] = entity_view('commerce_order', array($order->order_id => $order), 'pdf', NULL, TRUE);
    // Add a credit memo.
    if ($order->status == 'canceled') {
      $vars['viewed_orders'][] = entity_view('commerce_order', array($order->order_id => $order), 'canceled', NULL, TRUE);
    }
  }
  $css_files = variable_get('commerce_billy_pdf_css_files', array(drupal_get_path('module', 'commerce_billy_pdf') . '/css/pdf.css'));
  $vars['inline_css'] = "";
  foreach ($css_files as $file) {
    $vars['inline_css'] .= file_get_contents($file);
  }

  return theme('commerce_billy_pdf_page', $vars);
}

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