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invoiceninja/app/Libraries/Currency/Conversion/CurrencyConversionInterface.php

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<?php
/**
* Invoice Ninja (https://invoiceninja.com).
*
* @link https://github.com/invoiceninja/invoiceninja source repository
*
* @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
*
* @license https://opensource.org/licenses/AAL
*/
namespace App\Libraries\Currency\Conversion;
interface CurrencyConversionInterface
{
public function convert($amount, $from_currency_id, $to_currency_id, $date = null);
public function exchangeRate($from_currency_id, $to_currency_id, $date = null);
}