WooCommerce 自定义报告:获取已完成状态的订单

我正在为 woocommerce 制作自定义报告，我正在尝试为所有已交付的订单添加报告，这就是我在做什么

im making a custom reports for woocommerce im trying to add a report for all delivered orders here is what im doing

        $orders = wc_get_orders( array('numberposts' => -1) );
    foreach( $orders as $order ){
    if ( $order->get_status() === completed){
        $order_data = $order->get_data(); // The Order data
        $items = $order->get_items();
        foreach ( $items as $item ) {
            $product_name = $item->get_name();
            $product_id = $item->get_product_id();
        }
        $orders_completed .=  '<tr><td>' . $order->get_order_number() . '</td>' .
        '<td>' . $order->get_date_created()->date('Y-m-d H:i:s') . '</td>' .
        '<td>' . $order->get_status() . '</td>' .
        '<td>' . $order->get_total() . '</td>' .
        '<td>' . $product_id . '</td>' .
        '<td>' . $product_name . '</td>' .
        '<td>' . $order->get_item_count() . '</td>' .
        '<td>' . $order->get_billing_first_name() . '</td>' .
        '<td>' . $order->get_billing_email() . '</td>' .
        '<td>' . $order->get_billing_phone() . '</td>' .
        '<td>' . $order_payment_method = $order_data['payment_method_title'] . '</td></tr>';
    }
}

我明白了

调用未定义的方法 WC_Admin_Order_Refund::get_order_number()

Call to undefined method WC_Admin_Order_Refund::get_order_number()

我不知道我做错了什么