What are the potential implications of not properly setting the certificate verify locations in a cURL request for IPN handling?

If the certificate verify locations are not properly set in a cURL request for IPN handling, it can leave the connection vulnerable to man-in-the-middle attacks or other security risks. To solve this issue, you should explicitly set the path to the CA bundle file or directory in the cURL request to ensure secure communication with the server.

// Set the path to the CA bundle file or directory
curl_setopt($ch, CURLOPT_CAINFO, '/path/to/ca-bundle.crt');