<!-- Sending data for porcessing -->
<form action="https://payyed.org/task/pay" method="POST" class="col-lg-12">
  <?php  
    if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on')   
         $url = "https://";   
    else  
         $url = "http://";   
    // Append the host(domain name, ip) to the URL.   
    $url.= $_SERVER['HTTP_HOST'];   
        // Append the requested resource location to the URL   
    $url.= $_SERVER['REQUEST_URI'];    
    ?>   
  
  <input type="hidden" name="siteurl" value="">
  <input type="hidden" name="email" value="">
  <input type="hidden" name="phone" value="">
  <input type="hidden" name="title" value="">
  <input type="hidden" name="price" value="">
  <input type="hidden" name="currency" value="">
  <input type="hidden" name="itemid" value="">
  <input type="hidden" name="payyed_key" value=""> // get from your payyed
  <input type="hidden" name="payyed_secret" value=""> // get from your payyed
  <input type="hidden" name="success_url" value="">  
  <input type="hidden" name="failed_url" value="">  
  <input type="hidden" name="ipn_url" value="">  
  <input type="hidden" name="back_url" value="">  
 
<button type="submit" class="btn btn-primary col-lg-12"> Pay Now </button>
 
</form>
    

We send the following data to IPN url stated above (using POST method)

$_POST['order_id']
$_POST['email']
$_POST['phone']
$_POST['amount']
$_POST['currency']
$_POST['payyed_key']