/*** Mandatory data ***/
// Post URL (Get this value from the Integration Help menu of this plugin)
$postURL = "http://www.example.com/wp-content/plugins/wp-pdf-stamper/api/stamp_api.php";
// The Secret key (Get this value from the settings menu of this plugin)
$secretKey = "4bc67180656782.45045137";
//The source file URL (The file that you want to stamp)
$fileURL = "http://www.example.com/wp-content/uploads/test-ebook.pdf";
 
/*** Optional Data ***/
//Customers Name
$customerName = "John Doe";
//Customer Email address
$customerEmail = "john.doe@gmail.com";
//Customer's Address
$customerAddress = "123 Some Street, San Jose, CA - 95130, U.S.A.";

// prepare the data
$data = array ();
$data['secret_key'] = $secretKey;
$data['source_file'] = $fileURL;
$data['customer_name'] = $customerName;
$data['customer_email'] = $customerEmail;
$data['customer_address'] = $customerAddress;

// send data to post URL
$ch = curl_init ($postURL);
curl_setopt ($ch, CURLOPT_POST, true);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
$returnValue = curl_exec ($ch);

// Process the return values
list ($status, $value) = explode ('\n', $returnValue);
if(empty($value)){
    list ($status, $value) = explode (' ', $returnValue); 
}
$status = trim($status);
$value = trim($value);

if(strpos($status,"Success!") !== false)
{
    $file_url = trim($value);
    echo "The URL of the stamped file is: ".$file_url;
}
else
{
    echo "An error occured while trying to stamp the file! Error details: ".$value;
}