yii\authclient\OAuthToken::getToken PHP Method

    public function getToken()
    {
        return $this->getParam($this->tokenParamKey);
    }

 /**
  * Performs request to the OAuth API.
  * @param OAuthToken $accessToken actual access token.
  * @param string $url absolute API URL.
  * @param string $method request method.
  * @param array $params request parameters.
  * @return array API response.
  * @throws Exception on failure.
  */
 protected function apiInternal($accessToken, $url, $method, array $params)
 {
     $params['oauth_consumer_key'] = $this->consumerKey;
     $params['oauth_token'] = $accessToken->getToken();
     $response = $this->sendSignedRequest($method, $url, $params);
     return $response;
 }