src/Client.php
public function createRefund($request)
    {
        if (!($request instanceof CreateRefundRequest)) {
            $request = RequestCreator::create(CreateRefundRequest::class, $request);
        }

        ObjectRecursiveValidator::validate($request);
        $serializer = new CreateRefundSerializer($request);
        $transport = new CreateRefundTransport($serializer);

        return $this->execute($transport, CreateRefundResponse::class);
    }
public function createRefund($request)
    {
        if (!($request instanceof CreateRefundRequest)) {
            $request = RequestCreator::create(CreateRefundRequest::class, $request);
        }

        ObjectRecursiveValidator::validate($request);
        $serializer = new CreateRefundSerializer($request);
        $transport = new CreateRefundTransport($serializer);

        return $this->execute($transport, CreateRefundResponse::class);
    }
@param array|CreateRefundRequest $request

@return AbstractResponse|CreateRefundResponse
@throws ResponseException
@throws TransportException