致命错误：调用未定义的函数wp_mail()

我正在使用插件wordpress-simple-paypal-shopping-cart 对于我的购物车要求。我试图通过这个插件发送电子邮件时，一些付款是通过使用IPN。

我的代码：

$invoiceProducts = $_SESSION[\'simpleCart\'];
    if(isset($invoiceProducts) && !empty($invoiceProducts)){
        $html = renderHTML($invoiceProducts);
        generatePDF($html);
        unset($invoiceProducts);
    }

function renderHTML($param){
    $IPN = $_POST;

    $name = $IPN[\'first_name\'];
    $donationAmount = $IPN[\'payment_gross\'];
    $contributorsEmail = $IPN[\'payer_email\'];
    $contributorsPhone = $IPN[\'payer_email\'];
    $contributorsAddr = $IPN[\'address_name\'] . \', \' . $IPN[\'address_city\'] . \', \' . $IPN[\'address_country\'];

    //We will need to shoot email to laura of successfull payment.
    $to = \'[email protected]\';
    $subject = \'Donation made on your website\';
    $message = \'\';
    $message .= \'<html><body>\';
    $message .= \'<p>You have received a contribution from<strong>\'.$name.\'</strong> of <strong>\'.$donationAmount.\'</strong></p>\';
    $message .= \'<p>Contributor Information:</p>\';
    $message .= \'<ul>\';
    $message .= \'<li>Name:\'.$name.\'</li>\';
    $message .= \'<li>Amount:\'.$donationAmount.\'</li>\';
    $message .= \'<li>Email:\'.$contributorsEmail.\'</li>\';
    $message .= \'<li>Address:\'.$contributorsAddr.\'</li>\';
    $message .= \'</ul>\';
    $message .= \'</body></html>\';

    wp_mail( $to, $subject, $message, $headers, $attachments );
}

但调用此函数时，我会遇到以下错误：Fatal error: Call to undefined function wp_mail()

我知道为什么会出现这个错误，只是我的插件是先加载的，而不是先加载的wp_mail().

就我而言，我该怎么打电话wp_mail() 先是我的插件？

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