invoiceninja/app/Services/Payment/UpdateInvoicePayment.php

<?php

namespace App\Services\Payment;

use App\Helpers\Email\PaymentEmail;
use App\Jobs\Payment\EmailPayment;
use App\Jobs\Util\SystemLogger;
use App\Models\Invoice;
use App\Models\SystemLog;

class UpdateInvoicePayment
{
    /**
     * @deprecated This is bad logic, assumes too much.
     */
    public $payment;

    public function __construct($payment)
    {
        $this->payment = $payment;
    }

    public function run()
    {
        $invoices = $this->payment->invoices()->get();

        $invoices_total = $invoices->sum('balance');

        /* Simplest scenario - All invoices are paid in full*/
        if (strval($invoices_total) === strval($this->payment->amount)) {
            $invoices->each(function ($invoice) {
                $this->payment
                     ->ledger()
                     ->updatePaymentBalance($invoice->balance*-1);
                
                $this->payment->client
                    ->service()
                    ->updateBalance($invoice->balance*-1)
                    ->updatePaidToDate($invoice->balance)
                    ->save();
                
                $invoice->pivot->amount = $invoice->balance;
                $invoice->pivot->save();

                $invoice->service()
                    ->clearPartial()
                    ->updateBalance($invoice->balance*-1)
                    ->save();
            });
        }
        /*Combination of partials and full invoices are being paid*/
        else {
            $total = 0;

            /* Calculate the grand total of the invoices*/
            foreach ($invoices as $invoice) {
                if ($invoice->hasPartial()) {
                    $total += $invoice->partial;
                } else {
                    $total += $invoice->balance;
                }
            }

            /*Test if there is a batch of partial invoices that have been paid */
            if ($this->payment->amount == $total) {
                $invoices->each(function ($invoice) {
                    if ($invoice->hasPartial()) {
                        $this->payment
                             ->ledger()
                             ->updatePaymentBalance($invoice->partial*-1);

                        $this->payment->client->service()
                                                ->updateBalance($invoice->partial*-1)
                                                ->updatePaidToDate($invoice->partial)
                                                ->save();

                        $invoice->pivot->amount = $invoice->partial;
                        $invoice->pivot->save();

                        $invoice->service()->updateBalance($invoice->partial*-1)
                                ->clearPartial()
                                ->setDueDate()
                                ->setStatus(Invoice::STATUS_PARTIAL)
                                ->save();
                    } else {
                        $this->payment
                             ->ledger()
                             ->updatePaymentBalance($invoice->balance*-1);

                        $this->payment->client->service()
                                              ->updateBalance($invoice->balance*-1)
                                              ->updatePaidToDate($invoice->balance)
                                              ->save();

                        $invoice->pivot->amount = $invoice->balance;
                        $invoice->pivot->save();
                        
                        $invoice->service()->clearPartial()->updateBalance($invoice->balance*-1)->save();
                    }
                });
            } else {
                SystemLogger::dispatch(
                    [
                        'payment' => $this->payment,
                        'invoices' => $invoices,
                        'invoices_total' => $invoices_total,
                        'payment_amount' => $this->payment->amount,
                        'partial_check_amount' => $total,
                    ],
                    SystemLog::CATEGORY_GATEWAY_RESPONSE,
                    SystemLog::EVENT_PAYMENT_RECONCILIATION_FAILURE,
                    SystemLog::TYPE_LEDGER,
                    $this->payment->client
                );

                throw new \Exception("payment amount {$this->payment->amount} does not match invoice totals {$invoices_total} reversing payment");

                $this->payment->invoice()->delete();
                $this->payment->is_deleted=true;
                $this->payment->save();
                $this->payment->delete();
            }
        }

        return $this->payment;
    }
}