Sure, here’s an example of making a cURL request with username and password using PHP:

<?php
// API endpoint URL
$apiUrl = 'https://example.com/api/endpoint';

// Your username and password for authentication
$username = 'your_username';
$password = 'your_password';

// Create cURL resource
$ch = curl_init($apiUrl);

// Set cURL options
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, $username . ':' . $password);

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

// Check for cURL errors
if (curl_errno($ch)) {
    echo 'cURL error: ' . curl_error($ch);
}

// Close cURL resource
curl_close($ch);

// Process the response
if ($response) {
    // Do something with the API response
    echo $response;
} else {
    // Handle the case where the request failed
    echo 'Request failed';
}
?>

Replace 'https://example.com/api/endpoint' with the actual API endpoint URL you want to call. Also, replace 'your_username' and 'your_password' with the valid credentials required for authentication with the API. The example uses HTTP basic authentication to send the username and password in the cURL request header. Remember to use HTTPS for secure communication with the API to protect sensitive information.