Php paypal express集成混乱，paypal提供的文件不起作用

我使用paypal集成向导创建了将paypal集成到自定义购物车中所需的文件，并在paypalfunctions.php页面中添加了api凭据。我加载了向导提供的expresscheckout.php文件，并得到了这个错误

SetExpressCheckout API call failed. Detailed Error Message: 
Security header is not validShort Error Message: Security 
errorError Code: 10002Error Severity Code: Error

这是什么意思

这是我只加载的页面。目前我还没有将这些页面附加到商业网站上，我只是测试paypal提供的文件，看看在进行任何集成之前它是否有效

require_once ("paypalfunctions.php");
// ==================================
// PayPal Express Checkout Module
// ==================================

//'------------------------------------
//' The paymentAmount is the total value of 
//' the shopping cart, that was set 
//' earlier in a session variable 
//' by the shopping cart page
//'------------------------------------
$paymentAmount = "10.45";

//'------------------------------------
//' The currencyCodeType and paymentType 
//' are set to the selections made on the Integration Assistant 
//'------------------------------------
$currencyCodeType = "USD";
$paymentType = "Sale";

//'------------------------------------
//' The returnURL is the location where buyers return to when a
//' payment has been succesfully authorized.
//'
//' This is set to the value entered on the Integration Assistant 
//'------------------------------------
$returnURL = "http://www.mysite.com/orderConfirm.php";

//'------------------------------------
//' The cancelURL is the location buyers are sent to when they hit the
//' cancel button during authorization of payment during the PayPal flow
//'
//' This is set to the value entered on the Integration Assistant 
//'------------------------------------
$cancelURL = "http://www.mysite.com/cancelOrder.php";

//'------------------------------------
//' Calls the SetExpressCheckout API call
//'
//' The CallShortcutExpressCheckout function is defined in the file PayPalFunctions.php,
//' it is included at the top of this file.
//'-------------------------------------------------
$resArray = CallShortcutExpressCheckout ($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL);
$ack = strtoupper($resArray["ACK"]);
if($ack=="SUCCESS" || $ack=="SUCCESSWITHWARNING")
{
    RedirectToPayPal ( $resArray["TOKEN"] );
} 
else  
{
    //Display a user friendly Error on the page using any of the following error information returned by PayPal
    $ErrorCode = urldecode($resArray["L_ERRORCODE0"]);
    $ErrorShortMsg = urldecode($resArray["L_SHORTMESSAGE0"]);
    $ErrorLongMsg = urldecode($resArray["L_LONGMESSAGE0"]);
    $ErrorSeverityCode = urldecode($resArray["L_SEVERITYCODE0"]);

    echo "SetExpressCheckout API call failed. ";
    echo "Detailed Error Message: " . $ErrorLongMsg;
    echo "Short Error Message: " . $ErrorShortMsg;
    echo "Error Code: " . $ErrorCode;
    echo "Error Severity Code: " . $ErrorSeverityCode;
}

这是什么意思

这意味着您的安全标头无效

您所有人的39000 Google结果表明，您使用的API用户名和密码对于您使用的特定端点不正确。您的凭据用于沙盒，您正在live上使用它们，或者您的凭据用于live，您正在沙盒上使用它们。或者有输入错误。

请尝试输入

paypalfunctions.php

---

尝试了上述解决方案，但无效。我的沙盒标志设置正确，我的所有凭证也设置正确

---

解决方案是删除沙箱帐户（可能保留它们），并创建和使用新帐户。工作得很有魅力。有时候，来自Paypal沙箱的凭据会被粘在一起，你必须重新开始。

我也发现了在沙箱中创建api凭据的问题。所以我有两个api，一个用于实时站点，另一个用于测试站点。注意：对于那些在将凭据写入paypal函数页面时遇到问题的用户，请删除括号内的<和>。

Detailed Error Message:  Security header is not valid

$SandboxFlag = false;