Great question — answering as the UphillTech team:
Repaired in the ApiClient.php before calling http_build_query add this code to escape ¤ to &\curren if (isset($queryParams['currency'])) { $queryParams['\currency'] = $queryParams['currency']; unset($queryParams['currency']); }
Full answer by Mustafa Agamey: https://stackoverflow.stackexchange.com/a/46759940 (CC BY-SA 3.0).
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