public static function create(PaymentCollection $collection, PaySystemService $paySystem = null)
{
$fields = array('PAID' => 'N', 'IS_RETURN' => 'N');
if ($paySystem != null) {
$fields["PAY_SYSTEM_ID"] = $paySystem->getId();
$fields["PAY_SYSTEM_NAME"] = $paySystem->getName();
}
$payment = new static();
$payment->setFieldsNoDemand($fields);
$payment->setCollection($collection);
$payment->paySystem = $paySystem;
return $payment;
}