*
 * $Date: 2012-11-21 12:02:12 +0100 (Wed, 21 Nov 2012) $
 * @version SofortLib 1.5.0  $Id: example_sofortrechnung.php 5724 2012-11-21 11:02:12Z rotsch $
 * @author SOFORT AG http://www.sofort.com (integration@sofort.com)
 *
 */
require_once '../../../library/sofortLib.php';
define('CONFIGKEY', '1111:2222:6f3d938b65eb833e695393985e1r13z79c');
//your configkey or userid:projektid:apikey
$PnagInvoice = new PnagInvoice(CONFIGKEY);
$PnagInvoice->setVersion('MY_VERSION');
$PnagInvoice->addInvoiceAddress('John', 'Doe', 'Street', '15', '35578', 'City', 2, 'Max Mustermann', '3 Stock', 'Firma ABC');
//try firstname 'success' or 'decline' as firstname
$PnagInvoice->addShippingAddress('John', 'Doe', 'Street', '15', '35578', 'City', 2);
$PnagInvoice->setReason('Invoice', 'Invoice');
$PnagInvoice->setOrderId('213124');
$PnagInvoice->setCustomerId('213124');
$PnagInvoice->setDebitorVatNumber('DE325236');
$PnagInvoice->setEmailCustomer('*****@*****.**');
$PnagInvoice->addItemToInvoice(md5('unique'), 'Art01', 'a simple title', 1.2, 0, 'a simple description', 6, 19);
$PnagInvoice->setSuccessUrl('https://{website}/');
$PnagInvoice->setAbortUrl('https://{website}/');
$PnagInvoice->setTimeoutUrl('https://{website}/');
$PnagInvoice->setNotificationUrl('https://{website}/');
$err = $PnagInvoice->checkout();
$PnagInvoice->confirmInvoice($PnagInvoice->transactionId);
if ($PnagInvoice->isError()) {
    //PNAG-API didn't accept the data
    echo $PnagInvoice->getError();
} else {
    //buyer must be redirected to $paymentUrl else payment cannot be successfully completed!