<?php
//TODO: set your API key found in http://wyday.com/limelm/settings/
$api_key = 'PASTE THE API KEY HERE';

//TODO: set the version id to generate & find keys for
// the version id is found in the url. For example http://wyday.com/limelm/version/100/
// the version id is 100.
$version_id = '100';

date_default_timezone_set('America/Toronto');

function urlEncodePostData($post_data)
{
    $post_string = '';
    foreach ($post_data as $key => $value)
    {
        if (is_array($value))
        {
            foreach ($value as $sub_value)
            {
                $post_string .= $key.'[]='.urlencode($sub_value).'&';
            }
        }
        else
            $post_string .= $key.'='.urlencode($value).'&';
    }
    $post_string = rtrim($post_string, '& ');

    $request = curl_init('https://wyday.com/limelm/api/rest/');
    curl_setopt($request, CURLOPT_HEADER, 0);
    curl_setopt($request, CURLOPT_ENCODING, "");
    curl_setopt($request, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($request, CURLOPT_POSTFIELDS, $post_string);
    curl_setopt($request, CURLOPT_SSL_VERIFYPEER, TRUE);
    return $request;
}

function generateProductKey($post_data)
{
    $request = urlEncodePostData($post_data);
    $jObj = json_decode(curl_exec($request));

    if ($jObj->stat == 'ok')
    {
        foreach ($jObj->pkeys->pkey as $pkey)
        {
            return $pkey->key;
        }
    }
    else
    {
        // Uncomment the next line to see the error LimeLM is giving you.
        echo $jObj->message;
    }
    return null;
}

try
{
    $post_data = array
    (
        'method' => 'limelm.pkey.generate',
        'api_key' => $api_key,
        'version_id' => $version_id,
        'num_keys' => 1,
        'num_acts' => $quantity,
        'email' => $email,
        'feature_name' => array('fastspring_subscription_id', 'subscription_expiry'),
        'feature value' => array($reference, date('Y-m-d H:i:s', strtotime('+1 year'))),
        'nojsoncallback' => 1,
        'format' => 'json'
    );
    $product_key = generateProductKey($post_data);
    echo $product_key . "\r\n";
}
catch (Exception $e)
{
    // Uncomment the next line to see the exception.
    //echo 'Failure: '.$e->getMessage();
}
?>