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<?php
declare(strict_types=1);
namespace Money;
use Money\Exception\UnresolvableCurrencyPairException;
/**
* Provides a way to get exchange rate from a third-party source and return a currency pair.
*/
interface Exchange
{
/**
* Returns a currency pair for the passed currencies with the rate coming from a third-party source.
*
* @throws UnresolvableCurrencyPairException When there is no currency pair (rate) available for the given currencies.
*/
public function quote(Currency $baseCurrency, Currency $counterCurrency): CurrencyPair;
}