/**
  * @return AccessToken
  */
 protected function createNewAccessToken()
 {
     $authResponse = $this->authClient->auth();
     $accessToken = new AccessToken();
     $accessToken->setToken($authResponse->getAccessToken());
     $accessToken->setTokenType($authResponse->getTokenType());
     $accessToken->setExpiresIn($authResponse->getExpiresIn());
     return $accessToken;
 }