App\Ninja\Presenters\InvoicePresenter::balanceDueLabel PHP Method

    public function balanceDueLabel()
    {
        if ($this->entity->partial > 0) {
            return 'partial_due';
        } elseif ($this->entity->isType(INVOICE_TYPE_QUOTE)) {
            return 'total';
        } else {
            return 'balance_due';
        }
    }