我是一名游戏开发人员，不太熟悉网络编程。我正在尝试将我的网站积分系统MyCred与我的游戏联系起来。Mycred有用于与其他站点的点进行交互的代码片段。我使用了他们的代码片段，但我一直收到以下错误：

致命错误：require（）：无法打开required“WP\\u DIRwp-blog-header”。php“（include\\u path=”.：/usr/lib/php7.2“）位于http://homepages/24/d773619225/htdocs/clickandbuilds/SefronGames/Gameconnect/KC。php在线

我在网上搜索了一下，并尝试在顶部添加代码来加载wp，但没有成功。仍然抛出错误。以下是我遇到问题的php代码：

<?php
require WP_DIR.\'wp-blog-header.php\';
$secret_key = \'I took this off to protect info\';
$remote_url = \'I took this off to protect info \';

$action     = \'CREDIT\';
$account    = \'[email protected]\';
$amount     = 10;
$ref        = \'reference\';
$ref_id     = 0;
$entry      = \'Points for viewing video\';
$data       = \'optional extra\';
$point_type = \'Kanobia Credit\';
$host       = get_bloginfo( \'url\' );

$token      = md5( $host . $action . $amount . $secret_key );

$request    = array(
    \'method\' => \'POST\',
    \'body\'   => array(
        \'action\'  => $action,
        \'account\' => $account,
        \'amount\'  => $amount,
        \'ref\'     => $ref,
        \'ref_id\'  => $ref_id,
        \'type\'    => $point_type,
        \'entry\'   => $entry,
        \'data\'    => $data,
        \'token\'   => $token,
        \'host\'    => $host
    )
);

$response = wp_remote_post( $remote_url, $request );
?>