exchange-2.0/app/Classes/Modules/CurrencyRates/DataTransferObjects/CurrencyRateObject.php

<?php

namespace App\Classes\Modules\CurrencyRates\DataTransferObjects;

use App\Classes\Interfaces\DataTransferObject;

class CurrencyRateObject implements DataTransferObject
{
    /** @var int|null */
    private $currency_id;

    /** @var string|null */
    private $selling;

    /** @var string|null */
    private $payment_method_type;

    /**
     * CurrencyRateObject constructor.
     * @param int|null $currency_id
     * @param string|null $selling
     * @param string|null $payment_method_type
     */
    public function __construct(
        ?int $currency_id, 
        ?string $selling, 
        ?string $payment_method_type
    )
    {
        $this->currency_id = $currency_id;
        $this->selling = $selling;
        $this->payment_method_type = $payment_method_type;
    }

    /**
     * @return int
     */
    public function getCurrencyId(): ?int
    {
        return $this->currency_id;
    }

    /**
     * @return string
     */
    public function getSelling(): ?string
    {
        return $this->selling;
    }

    /**
     * @return string
     */
    public function getPaymentMethodType(): ?string
    {
        return $this->payment_method_type;
    }
}