<?php require "../vendor/autoload.php"; // construct the request $request = new \ClearBooks\ExchangeRateRequest(); $request->baseCurrency = 'GBP'; // default $request->targetCurrency = 'USD'; $request->date = '2012-10-05'; $client = new \ClearBooks\Client('demo'); $rate = $client->getExchangeRate($request); print_r($rate); /* 1.6184948525068 */