WooCommerce Mark Virtual Orders as Complete

woocommerce-vitual-mark-complete.php

//Mark Virtual Orders as Complete
add_filter( 'woocommerce_payment_complete_order_status', 'virtual_order_payment_complete_order_status', 10, 2 );

function virtual_order_payment_complete_order_status( $order_status, $order_id ) {
  $order = new WC_Order( $order_id );

  if ( $order_status == 'processing' &&
       ( $order->status == 'on-hold' || $order->status == 'pending' || $order->status == 'failed' ) ) {
    $virtual_order = true;

    if ( count( $order->get_items() ) > 0 ) {
      foreach( $order->get_items() as $item ) {

        if ( $item['id'] > 0 ) {

          $_product = $order->get_product_from_item( $item );

          if ( ! $_product->is_virtual() ) {
            $virtual_order = false;
            break;
          }

        }
      }
    }

    // virtual order, mark as completed
    if ( $virtual_order ) {
      return 'completed';
    }
  }

  // non-virtual order, return original status
  return $order_status;
}