mycred jQuery post 积分消费

<?php /* Template Name: Purchase Point*/ ?>

<?php
if(is_user_logged_in()) {
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
            $purcahse_user_id = trim($_POST['purcahse_id_val']);
            if (empty($purcahse_user_id)) {
                echo "输入的ID为空！！！";
            } else {
                $purcahse_user_balance = mycred_get_users_balance( $purcahse_user_id );
                if($purcahse_user_balance <100) {
                        echo "该用户积分不足！！！";
                } else {
                        mycred_subtract( 'penalty', $purcahse_user_id, -100, '积分消费' );
                        echo "用户ID:".$purcahse_user_id.",成功消费100基本！";
                }
            }
        }
} else {
        echo "请先登录！";
}
?>