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<?php
declare(strict_types=1);
namespace Brick\Money;
use Brick\Money\Exception\CurrencyConversionException;
use Brick\Math\BigNumber;
/**
* Interface for exchange rate providers.
*/
interface ExchangeRateProvider
{
/**
* @param string $sourceCurrencyCode The source currency code.
* @param string $targetCurrencyCode The target currency code.
*
* @return BigNumber|int|float|string The exchange rate.
*
* @throws CurrencyConversionException If the exchange rate is not available.
*/
public function getExchangeRate(string $sourceCurrencyCode, string $targetCurrencyCode);
}