oficial/app/common/Define/Money/Provider.php

<?php
namespace Incoviba\Common\Define\Money;

use DateTimeInterface;
use Incoviba\Common\Implement\Exception\EmptyResponse;

interface Provider
{
    /**
     * @param string $money_symbol
     * @param ?DateTimeInterface $dateTime = null
     * @return float
     * @throws EmptyResponse
     */
    public function get(string $money_symbol, ?DateTimeInterface $dateTime = null): float;
}