protected function getUserByToken(AccessTokenInterface $token)
{
$fields = implode(',', $this->fields);
$url = 'https://api.linkedin.com/v1/people/~:(' . $fields . ')';
$response = $this->getHttpClient()->get($url, ['headers' => ['x-li-format' => 'json', 'Authorization' => 'Bearer ' . $token]]);
return json_decode($response->getBody(), true);
}