PHP 贝宝 Auth/Capture NVP 集成问题

Question

背景：

我们使用 NVP 集成和 php-curl 实现了 Paypal 授权和捕获流程。
PayPal 开发者网站上描述了完整的过程：https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/ht_ec-singleAuthPayment-curl-etc/

在我们的网站上，当前的支付场景是：
- 首先，用户点击按钮启动支付授权，将他重定向到 PayPal 网站（SetExpressCheckout with paymentaction=Authorization）
- 如果用户在 PayPal 网站上成功确认付款，他将在特定的成功页面上被重定向到我们的网站
- 这个 "success page" 从 PayPal 网站得到一个 token 和一个 PayerID，然后我们调用 GetExpressCheckoutDetails 来检查状态和金额此授权
- 如果一切正常，我们告诉 PayPal 确认此授权（DoExpressCheckoutPayment with paymentaction=Authorization）并且我们获得一个授权 ID 以存储到我们的数据库中
- 稍后，其他人可以使用我们存储的授权 ID (DoCapture) 通过单击按钮来结算交易

附加信息：

根据 PayPal 文档：

PayPal honors 100% of authorized funds for three days
The accounts of buyers and merchants cannot be closed if there is a pending (unsettled) authorization
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/authcapture/

在我们的网站上，如果未在 24 小时内结算，授权将自动作废。（使用 crontab）

问题：

最后一部分出现问题（当我们调用 "confirm" 函数时）：当用户单击 "confirm" 按钮时，似乎有时 curl 请求需要时间来获取从 PayPal 返回的交易 ID。
发生这种情况时，用户通常会关闭网页，PayPal 会确认授权（并因此确认汇款），但我们的网站不会收到通知，因为以下代码（来自 "Source Code" 下面的部分）尚未执行或达到：

if ($transaction_id) {
    /*
     * [...]
     * Everything is ok, payment has been performed
     * so we do everything to give our user what he asked for
     */
} else {
    // Error : No transaction id
}

因为脚本在获得 curl 响应之前停止。
此外，如果我们尝试再次点击该按钮，PayPal 会告诉我们授权 ID 不存在（因为已经执行过）。

但有时一切正常，没有任何问题或滞后。

源代码：

/*
 * This is our main function, called when
 * we have to settle our transaction 
 * when an user click on a "confirm" button
**/
public function confirm($cart_id) {
    /*
     * [...]
     * We check lot of stuff to be sure this user 
     * can perform this action
     */

    // We get theses values from the database
    authorization_id = "lorem ipsum";
    $amount = 10; 

    // We tell PayPal to settle the transaction
    $transaction_id = $this->settle_transaction($authorization_id, $amount);
    if ($transaction_id) {
        /*
         * [...]
         * Everything is ok, payment has been performed
         * so we do everything to give our user what he asked for
         */
    } else {
        // Error : No transaction id
    }
}

private function settle_transaction($authorization_id, $amount) {
    // Our credentials
    $params = array(
        "USER" => $this->paypal_user,
        "PWD" => $this->paypal_pwd,
        "SIGNATURE" => $this->paypal_signature,
        "VERSION" => 95
    );
    $params["METHOD"] = "DoCapture";
    $params["AUTHORIZATIONID"] = $authorization_id;
    $params["AMT"] = $amount;
    $params["CURRENCYCODE"] = "EUR";
    $params["COMPLETETYPE"] = "Complete";

    $result = $this->curl($params);
    if ($result) {
        // We check that this PayPal request has been successful
        if ($result["ACK"] == "Success") {
            $transaction_id = $result["TRANSACTIONID"];
            if ($result["PAYMENTSTATUS"] == "Completed") {
                return $transaction_id;
            }
        }
    }
    return NULL;
}


private function curl($params) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $this->paypal_endpoint);
    curl_setopt($ch, CURLOPT_POST, count($params));
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    parse_str(curl_exec($ch), $result);
    curl_close($ch);
    return $result;
}

您有解决此问题的想法吗？
我正在考虑在脚本末尾结算交易，因为 PayPal 会在三天内兑现 100% 的授权资金，而我只需要将它们保留 1 天，但我不确定这一点......

编辑 1：

我的 apache2 error.log 报告了这个问题：

[Mon Aug 08 20:42:55.959330 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:42:56.960453 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:42:57.961188 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:42:58.962230 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:42:59.963297 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:00.964384 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:01.965476 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:02.966478 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:03.967595 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:04.968713 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:05.969783 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:06.970877 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:07.972002 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:08.972749 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:09.973847 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:10.974926 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:11.976080 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:12.977168 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:13.978244 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:14.979320 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:15.980414 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:16.981493 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:17.982578 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:18.983673 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:19.984762 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:20.985841 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:21.986650 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:22.987725 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:23.988826 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:24.989939 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:25.991061 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:26.992181 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:27.993305 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:28.994422 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:29.995556 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:30.996661 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:31.997774 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:32.998905 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:34.000089 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:35.001202 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:36.002326 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:37.003424 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:38.004551 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:39.005677 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:40.006799 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:41.007902 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:42.009021 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:43.010132 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:44.011245 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:45.012361 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:46.013479 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:47.014577 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:48.015685 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:49.016801 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:50.017906 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:51.018980 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:52.020049 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:53.021158 2016] [mpm_event:error] [pid 141:tid 3779940374400] AH00485: scoreboard is full, not at MaxRequestWorkers
[Mon Aug 08 20:43:53.391316 2016] [:error] [pid 980:tid 3779386513152] (104)Connection reset by peer: [client MY-IP:55236] FastCGI: failed to read from backend server, referer: http://####
[Mon Aug 08 21:18:04.748237 2016] [:error] [pid 1287:tid 3779782977280] (104)Connection reset by peer: [client MY-IP:37196] FastCGI: failed to read from backend server

编辑 2：

我发现 this topic 似乎有类似的问题 :

What is particularly strange is that the payment has been processed correctly.

现在我似乎无法重现这个错误。
您认为这可能是 PayPal 问题还是类似问题？
即使是，我也不想确保这个问题不会再次发生，但是如果我不能重现这个问题，我该如何测试？

Answer 1

您需要了解 ignore_user_abort(true);（可能还有 set_time_limit(0);），使用它来避免脚本在代码中途退出的问题。其次，我可以建议在 curl 调用之前更新最近确认的令牌数据库，这样如果用户退出，然后尝试再次按 "confirm"，你就会知道它已经是一个确认令牌，并且不要t重新运行这个curl代码，能不能马上通知用户？ -- http://php.net/manual/en/function.ignore-user-abort.php

并且警告，一些共享主机提供不允许允许ignore_user_abort/set_time_limit在运行时被修改

Answer 2

Note: Not all payments will be instant. If the buyer only has a bank account associated with their PayPal account, the transfer wont be instant. Therefore it is best practice to use IPN if want automatic notifications of all payments and related activities.

根据 PayPal 官方文档：

Instant Payment Notification (IPN) is a message service that notifies you of events related to PayPal transactions. You can use IPN messages to automate back-office and administrative functions, such as fulfilling orders, tracking customers, or providing status and other transaction-related information.

作为最佳实践，在您的 IPN Listener 中设置交易脚本。有关集成指南，您可以参考此处：https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNImplementation/

几个月前，我已经为 PayPal IPN Listener 延长了 PHP class。希望它可以帮助作为起点。随意分叉：https://github.com/datumradix/PayPal-IPN-PHP-Class-

编辑：(PayPal Documentation is not clear at many places and seems confusing to many first time readers)

IPN 可以作为确认 DoCapture 是否成功的辅助机制。 txn_type、txn_id、auth_id、auth_amount 和 payer_id 等 IPN 变量都通过 IPN 通知。请在此处参考完整列表：https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNandPDTVariables/

Note: We can either specify the NOTIFYURL in each call or we can setup the same from paypal back-end. For steps to setup the same from PayPal profile settings, ref :https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNSetup/

PHP 贝宝 Auth/Capture NVP 集成问题

PHP Paypal Auth/Capture NVP Integration Troubles

php

curl

paypal

payment

express-checkout

背景：

附加信息：

问题：

源代码：

编辑 1：

编辑 2：