Souke/domain/Document/Invoice/InvoiceSolver.php

<?php

namespace domain\Document\Invoice;

use common\helpers\Price;
use domain\Document\Document\DocumentSolver;
use domain\Order\Order\Order;

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, Order::INVOICE_AMOUNT_TOTAL));
    }
}