php – Paypal Integration – EWP设置错误

我正在通过PHP和MySQLi构建自己的电子商务商店.目前的测试站点是：http://taxreturnsolutions.uk/ecommerce/

我遵循了这个指南：https://www.codexworld.com/paypal-standard-payment-gateway-integration-php/

我有一切设置和工作绝对正常,我可以点击立即购买按钮,它将带我到沙盒网站,我可以购买.我的SQLi数据库将使用相关数据等进行更新.但是现在我不断从Paypal Sandbox收到以下消息,如下所示：

*注意URL：/ webapps / shoppingcart / error？flowlogging_id = 7be60528d708& code = EWP_SETTINGS

我每次按下立即购买按钮都会得到这个,但是在此之前,这是一个间歇性的问题,例如3/10次我使用现在购买按钮它会出现此错误并且正确处理7/10次.

我的按钮代码如下：

$paypalURL = "https://www.sandbox.paypal.com/cgi-bin/webscr"; //Test PayPal API URL
                    $paypalID = 'ukpwneduk-facilitator@hotmail.com'; //Business Email
                            <!-- Button -->
                            <?php 

                                    if(isset ($_SESSION['login_user'])){
                                            echo "
                                            <form action=' $paypalURL ' method='post' style='text-align: center;'>
                                                <!-- Identify your business so that you can collect the payments. -->
                                                <input type='hidden' name='business' value='$paypalID'>

                                                <!-- Specify a Buy Now button. -->
                                                <input type='hidden' name='cmd' value='_xclick'>

                                                <!-- Specify details about the item that buyers will purchase. -->
                                                <input type='hidden' name='product_name' value='$product_array[$key]['product_name']'>
                                                <input type='hidden' name='product_id' value='$product_array[$key]['product_id']'>
                                                <input type='hidden' name='product_price' value='$product_array[$key]['product_price']'>
                                                <input type='hidden' name='currency_code' value='GBP'>
                                                <input type='hidden' name='notify_url' value='http://taxreturnsolutions.uk/ecommerce/payments/ipn.php'> 

                                                <!-- Specify URLs -->
                                                <input type='hidden' name='cancel_return' value='http://taxreturnsolutions.uk/ecommerce/payments/cancel.php'>
                                                <input type='hidden' name='return' value='http://taxreturnsolutions.uk/ecommerce/payments/success.php'>


                                                <!-- Display the payment button. -->
                                                <input type='image' name='submit' border='0'
                                                src='https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif' alt='PayPal - The safer,easier way to pay online'>
                                                <img alt='' border='0' width='1' height='1' src='https://www.paypalobjects.com/en_US/i/scr/pixel.gif' >
                                            </form> ";

                                    } else
                                    {
                                    echo "<p style='text-align: center;'><b> Log in</b> to Buy Now </p>";
                                    }   
                                    ?>

任何帮助都将不胜感激.

谢谢.
斯坦.