Overtrue\Socialite\AccessTokenInterface::getToken PHP Method

    public function getToken();

 /**
  * {@inheritdoc}
  */
 protected function getUserByToken(AccessTokenInterface $token)
 {
     $userUrl = 'https://api.github.com/user?access_token=' . $token->getToken();
     $response = $this->getHttpClient()->get($userUrl, $this->getRequestOptions());
     $user = json_decode($response->getBody(), true);
     if (in_array('user:email', $this->scopes)) {
         $user['email'] = $this->getEmailByToken($token);
     }
     return $user;
 }