public function handle_webhook(WP_REST_Request $request) {
    // 1. Tratar validação inicial (CRC)
    $raw = $request->get_body();
    $data = json_decode($raw, true);
    
    if (isset($data['event']) && $data['event'] === 'endpoint.url_validation') {
        $plain = $data['payload']['plainToken'] ?? '';
        $encrypted = hash_hmac('sha256', $plain, self::VERIFICATION_TOKEN);
        return [
            'plainToken' => $plain,
            'encryptedToken' => $encrypted
        ];
    }

    // 2. Obter headers de forma confiável
    $all_headers = getallheaders();
    $ts = $all_headers['x-zm-request-timestamp'] ?? $all_headers['X-ZM-REQUEST-TIMESTAMP'] ?? '';
    $hash = $all_headers['x-zm-signature'] ?? $all_headers['X-ZM-SIGNATURE'] ?? '';
    $received_token = $all_headers['verification-token'] ?? $all_headers['VERIFICATION-TOKEN'] ?? '';

    // 3. Verificação de token legado
    if ($received_token !== self::VERIFICATION_TOKEN) {
        return new WP_REST_Response(['error' => 'Invalid verification token'], 401);
    }

    // 4. Calcular assinatura esperada
    $message = "v0:{$ts}:{$raw}";
    $expected = 'v0=' . hash_hmac('sha256', $message, self::VERIFICATION_TOKEN);

    // 5. Comparar assinaturas
    if (!hash_equals($expected, $hash)) {
        // Log detalhado para diagnóstico
        $log = "Falha na assinatura!\n";
        $log .= "Timestamp: {$ts}\n";
        $log .= "Recebido: {$hash}\n";
        $log .= "Esperado: {$expected}\n";
        $log .= "Mensagem: {$message}\n";
        file_put_contents(WP_CONTENT_DIR . '/zoom-debug.log', $log, FILE_APPEND);
        
        return new WP_REST_Response(['error' => 'Invalid signature'], 401);
    }

    // ... restante do código para processar gravações ...
}1 - Uncaught Error: Class "Zoom_Sync_Basic" not found in /home/wwwesmtc/public_html/wp-content/plugins/zoom-sync-basic/zoom-sync-basic.php:18
Stack trace:
#0 /home/wwwesmtc/public_html/wp-includes/class-wp-hook.php(324): {closure}('')
#1 /home/wwwesmtc/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#2 /home/wwwesmtc/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /home/wwwesmtc/public_html/wp-settings.php(578): do_action('plugins_loaded')
#4 /home/wwwesmtc/public_html/wp-config.php(82): require_once('/home/wwwesmtc/...')
#5 /home/wwwesmtc/public_html/wp-load.php(50): require_once('/home/wwwesmtc/...')
#6 /home/wwwesmtc/public_html/wp-blog-header.php(13): require_once('/home/wwwesmtc/...')
#7 /home/wwwesmtc/public_html/index.php(17): require('/home/wwwesmtc/...')
#8 {main}
  thrown - /home/wwwesmtc/public_html/wp-content/plugins/zoom-sync-basic/zoom-sync-basic.php - 18