create('app', [ 'appid' => $config['appid'], 'mchid' => $config['mch_id'], 'description' => '商品描述', 'out_trade_no' => $order, 'notify_url' => 'https://thinkadmin.top', 'amount' => ['total' => 2, 'currency' => 'CNY'], ]); echo '

';
    echo "\n--- 创建支付参数 ---\n";
    var_export($result);

    // 创建退款
    $out_refund_no = strval(time());
    $result = $payment->createRefund([
        'out_trade_no'  => $order,
        'out_refund_no' => $out_refund_no,
        'amount'        => [
            'refund'   => 2,
            'total'    => 2,
            'currency' => 'CNY'
        ]
    ]);
    echo "\n--- 创建退款订单 ---\n";
    var_export($result);

    $result = $payment->queryRefund($out_refund_no);

    echo "\n--- 查询退款订单 ---\n";
    var_export($result);

} catch (\Exception $exception) {
    // 出错啦，处理下吧
    echo $exception->getMessage() . PHP_EOL;
}