public function sendTransactions(TransactionsStore $store) : bool
    {
        $request = new Request(
            'POST',
            $this->getEndpoint('transactions'),
            $this->getRequestHeaders(),
            json_encode(new Transactions($this->config, $store))
        );

        $response = $this->client->send($request);
        return ($response->getStatusCode() >= 200 && $response->getStatusCode() < 300);
    }