data-importer/app/Services/CSV/Converter/BankDebitCredit.php

<?php
/**
 * BankDebitCredit.php
 * Copyright (c) 2020 james@firefly-iii.org
 *
 * This file is part of the Firefly III CSV importer
 * (https://github.com/firefly-iii/csv-importer).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace App\Services\CSV\Converter;


use Log;

/**
 *
 * Class BankDebitCredit
 */
class BankDebitCredit implements ConverterInterface
{

    /**
     * Convert a value.
     *
     * @param $value
     * @return mixed
     *
     */
    public function convert($value): int
    {
        Log::debug('Going to convert ', ['value' => $value]);
        $negative = [
            'D', // Old style Rabobank (NL). Short for "Debit"
            'A', // New style Rabobank (NL). Short for "Af"
            'DR', // https://old.reddit.com/r/FireflyIII/comments/bn2edf/generic_debitcredit_indicator/
            'Af', // ING (NL).
            'Debet', // Triodos (NL)
            'Debit', // ING (EN), thx Quibus!
            'S', // Volksbank (DE), Short for "Soll"
        ];
        if (in_array(trim($value), $negative, true)) {
            return -1;
        }

        return 1;
    }

    /**
     * Add extra configuration parameters.
     *
     * @param string $configuration
     */
    public function setConfiguration(string $configuration): void
    {

    }
}