$pbl = $payment->online(
new PaybylinkDirectbillingPayment(
'login',
'password',
'hash'
)
);
$pbl->setAmount(1.23);
$pbl->setDescription('description');
$pbl->setControl('myCustomData');
$pblPayment = $pbl->generatePayment();
$pblPayment->getTransactionId(); //transaction id
$pblPayment->getTransactionUrl(); //transaction url