CurrencyConfig.php

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<?php
namespace Magento\Directory\Model;

use Magento\Framework\App\Area;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\State;
use Magento\Store\Model\ScopeInterface;
use Magento\Store\Model\StoreManagerInterface;

class CurrencyConfig
{
    private $appState;

    private $config;

    private $storeManager;

    public function __construct(
        State $appState,
        ScopeConfigInterface $config,
        StoreManagerInterface $storeManager
    ) {
        $this->appState = $appState;
        $this->config = $config;
        $this->storeManager = $storeManager;
    }

    public function getConfigCurrencies(string $path)
    {
        $result = $this->appState->getAreaCode() === Area::AREA_ADMINHTML
            ? $this->getConfigForAllStores($path)
            : $this->getConfigForCurrentStore($path);
        sort($result);

        return array_unique($result);
    }

    private function getConfigForAllStores(string $path)
    {
        $storesResult = [[]];
        foreach ($this->storeManager->getStores() as $store) {
            $storesResult[] = explode(
                ',',
                $this->config->getValue($path, ScopeInterface::SCOPE_STORE, $store->getCode())
            );
        }

        return array_merge(...$storesResult);
    }

    private function getConfigForCurrentStore(string $path)
    {
        $store = $this->storeManager->getStore();

        return explode(',', $this->config->getValue($path, ScopeInterface::SCOPE_STORE, $store->getCode()));
    }
}