Race condition in FileCacheRetriever::cleanExpiredCache causes unlink warning

[angelopinto-conexa]

Problem

We are seeing intermittent production errors in the Efí PHP SDK during webhook processing.

The error happens inside the SDK cache cleanup flow:

ErrorException: Warning: unlink(/tmp/efi_cache/16a988f645d35901f1950abe61c611123173dcc4465ae70ed81e0cf46333f003): No such file or directory

Stack trace points to:

vendor/efipay/sdk-php-apis-efi/src/Efi/FileCacheRetriever.php
Efi\FileCacheRetriever::cleanExpiredCache
context line: unlink($file);

Our application code only calls:

$api = new EfiPay($options);
$chargeNotification = $api->getNotification($params, []);

Context

This happens during webhook notification handling.

The error appears to be related to the SDK file cache cleanup in /tmp/efi_cache.

Since webhook requests can happen concurrently, it seems possible that one process removes a cache file while another process is also trying to clean it.

When this happens, PHP raises a warning because the file no longer exists. In our framework, this warning becomes an unhandled ErrorException.

Expected behavior

The SDK cache cleanup should not fail the request if a cache file was already removed or is no longer available.

Environment

• SDK package: efipay/sdk-php-apis-efi
• Method used: EfiPay::getNotification
• Cache directory involved: /tmp/efi_cache
• Runtime: PHP application handling webhook requests

Question

Could you please check whether FileCacheRetriever::cleanExpiredCache() should tolerate cache files that no longer exist during cleanup?