Payment::setPaidAction

public function setPaidAction(BitrixSalePayment $payment, $value)
{
	$r = $payment->setPaid($value);
	if($r->isSuccess())
	{
		$this->save($payment, $r);
	}

	if(!$r->isSuccess())
	{
		$this->addErrors($r->getErrors());
		return null;
	}

	return true;
}