Voting Check

<?php
/**
 * Example vote postback receiver for YOUR game website / CMS.
 *
 * Configure this URL on your listing under Dashboard → Edit server → Vote Rewards.
 * This list will call it ONLY after a successful vote:
 *
 *   https://yoursite.com/postback.php?p_resp=PARAMETER&ip=USERIP
 *
 * PARAMETER is the username / account id the player entered on the vote form
 * (or the value from ?p= on your incentive voting link).
 *
 * Docs: /voting-check
 */

define('DEBUG', 0); // set to 1 to write _postback.log
define('LOG_FILE', __DIR__ . '/_postback.log');

/**
 * Only accept callbacks from the vote list's public IP.
 * Leave empty to skip the allowlist (not recommended in production).
 *
 * Example: define('VOTE_LIST_IP', '203.0.113.10');
 */
define('VOTE_LIST_IP', '');

$ipRequest = $_SERVER['HTTP_CF_CONNECTING_IP']
    ?? (isset($_SERVER['HTTP_X_FORWARDED_FOR'])
        ? trim(explode(',', (string) $_SERVER['HTTP_X_FORWARDED_FOR'])[0])
        : null)
    ?? $_SERVER['REMOTE_ADDR']
    ?? '';
$ipRequest = trim((string) $ipRequest);

if (VOTE_LIST_IP !== '' && $ipRequest !== VOTE_LIST_IP) {
    if (DEBUG) {
        error_log(date('[Y-m-d H:i] ') . "[Invalid] Request from {$ipRequest}" . PHP_EOL, 3, LOG_FILE);
    }
    http_response_code(403);
    exit('Forbidden');
}

if (DEBUG) {
    error_log(date('[Y-m-d H:i] ') . "[OK] Valid callback: {$ipRequest}" . PHP_EOL, 3, LOG_FILE);
}

// Clean parameters from the vote list (letters, numbers, underscore, hyphen).
$p = preg_replace('/[^A-Za-z0-9_\-]+/', '', (string) ($_GET['p_resp'] ?? '')) ?? '';
$userIp = preg_replace('/[^0-9a-fA-F:\.]+/', '', (string) ($_GET['ip'] ?? '')) ?? '';

if ($p === '') {
    http_response_code(400);
    exit('Missing p_resp');
}

if (DEBUG) {
    error_log(date('[Y-m-d H:i] ') . "[GET] Parameters [p_resp]={$p} [ip]={$userIp}" . PHP_EOL, 3, LOG_FILE);
}

// ---------------------------------------------------------------------------
// Connect to your database, verify account $p exists, enforce your own
// cooldown if needed, then grant vote points / items to $p (voted from $userIp).
// We send p_resp + ip ONLY when that player successfully voted on the list.
// ---------------------------------------------------------------------------

http_response_code(200);
echo 'OK';