PHP cURL Request with P12 Certificate: Sending Secure Requests to APIs

Performing a cURL request with a P12 certificate involves some additional steps compared to regular cURL requests. P12 certificates are used for client authentication in secure connections. Here’s an example of how you can make a PHP cURL request with a P12 certificate:


  1. You have a P12 certificate file (usually with the .p12 or .pfx extension) and know the certificate password.
  2. You are making a request to an HTTPS URL that requires client authentication using the P12 certificate.
// Replace these values with your actual P12 certificate file path and password
$certificatePath = '/path/to/your/certificate.p12';
$certificatePassword = 'your_certificate_password';

// URL to which you want to make the cURL request
$url = '';

// cURL options
$options = array(
    CURLOPT_URL => $url,
        // Add any custom headers if needed
        'Content-Type: application/json',
    CURLOPT_SSLCERT => $certificatePath,
    CURLOPT_SSLCERTPASSWD => $certificatePassword,
    CURLOPT_SSLCERTTYPE => 'P12', // Set the certificate type to P12
    CURLOPT_SSL_VERIFYPEER => true, // Set to false if you don't want to verify SSL certificates (not recommended for production)

// Initialize cURL session
$curl = curl_init();

// Set cURL options
curl_setopt_array($curl, $options);

// Execute the cURL request
$response = curl_exec($curl);

// Check for cURL errors
if (curl_errno($curl)) {
    echo 'cURL Error: ' . curl_error($curl);
} else {
    // Process the response
    echo 'Response: ' . $response;

// Close cURL session

Make sure to replace the placeholders in the code with the appropriate values for your specific use case. The CURLOPT_SSLCERT option is used to specify the path to the P12 certificate file and CURLOPT_SSLCERTPASSWD is used to set the password for the certificate.

Please note that handling P12 certificates requires extra care for security reasons. Ensure that the certificate file is kept secure, and consider using environment variables or other secure methods to store sensitive data like the certificate password.

Additionally, you might need to adjust other cURL options, such as HTTP headers and request data, based on the specific requirements of the API you are accessing.