public function getUser(string $employeeId)
    {
        $result = $this->getUserInternal([
            'employee_id' => $employeeId,
        ]);
        $statusCode = (int)$result[ 'statusCode' ];
        
        if ($statusCode === 200) {
            return $this->getResultAsArrayWithoutStatusCode($result);
        } elseif ($statusCode === 204) {
            return null;
        }
        
        $this->reportUnexpectedResponse($result, 1490808555);
    }