Vanuit programma iets in php invullen

<?php

//settings
$author_api_key = "Your-API-Key";
$author_username = "Your-Envato-Username";
$buyer_purchase_code = 'Your-Buyers-Purchase-Code';

//NOT required, but helpful!
$buyer_envato_name = 'Test';

//the api call
//create the url
$request_url = 'http://marketplace.envato.com/api/edge/'.$author_username.'/'.$author_api_key.'/verify-purchase:'.$buyer_purchase_code.'.json'; 

//make the call //could also use cURL - but for brevity:
$json_return = file_get_contents($request_url);  

//make sure return is not empty
if(empty($json_return)) die('Error connecting to the API system');

//decode json string into PHP Array
$json_data = json_decode($json_return, true);  

//if error isset - die showing error
if (isset($json_data['error'])) die($json_data['error']);

//still alive = no error
//if verify purchase is empty - die showing error
if (empty($json_data['verify-purchase'])) die('Invalid Purchase Code');

//verify buyers name - optional
//if you have your buyers Envato Username uncomment the next line
//if (strtolower($buyer_envato_name) !== strtolower($json_data['verify-purchase']['buyer'])) die('Envato Username Invalid');

//still alive = valid purchase

//do your custom stuff below -----------------------------------------

//show json decoded array - so you can see what is available to you.
print_r($json_data);

//available info:
//$json_data['verify-purchase']['item_name']
//$json_data['verify-purchase']['item_id']
//$json_data['verify-purchase']['created_at']
//$json_data['verify-purchase']['buyer']
//$json_data['verify-purchase']['licence']

//examples how to access specific info:
echo '<hr />';

//Show buyer name
echo 'Buyer: '.$json_data['verify-purchase']['buyer'].'<br />';

//Show license type
echo 'License Type: '.$json_data['verify-purchase']['licence'].'<br />';

//Show purchase date
echo 'Purchased: '.$json_data['verify-purchase']['created_at'].'<br />';

//other example:
echo '<hr />';
echo    'Hey '.$json_data['verify-purchase']['buyer'].', 
        I appreciate you buying a '.$json_data['verify-purchase']['licence'].' 
        to my '.$json_data['verify-purchase']['item_name'].' on 
        '.$json_data['verify-purchase']['created_at'];

public bool sendActivationRequest(){
if(!isValidKey(textBox2.Text)) return false;//Kijken of het een geldige sleutel is, anders Stoppen
var webClient = WebClient();//Webclient maken
String result = webClient.downloadString("https://xx.com/activate.php?KEY="+textBox2.text);//Request maken met data mee sturen
return Activate("Result");//Resultaat door sturen voor de rest van de activatie
}