Souke/common/logic/Document/Invoice/Service/InvoiceSolver.php

<?php

namespace common\logic\Document\Invoice\Service;

use common\helpers\Price;
use common\logic\Document\Document\Service\DocumentSolver;
use common\logic\Document\Invoice\Model\Invoice;

class InvoiceSolver extends DocumentSolver
{
    public function getInvoiceAmountPaid(Invoice $invoice): float
    {
        $amountPaid = 0;

        foreach($invoice->payments as $payment) {
            $amountPaid += $payment->amount;
        }

        return $amountPaid;
    }

    public function isInvoicePaid(Invoice $invoice): bool
    {
        return $this->getInvoiceAmountPaid($invoice) >= Price::numberTwoDecimals($this->getAmountWithTax($invoice));
    }
}