after.php

<?php

class Client extends GuzzleClient implements ClientInterface
{
  /**
   * {@inheritdoc}
   */
  public function authenticatedRequest($method = 'GET', $url = null, UserInterface $user, $options = [])
  {
      $duration = isset($options['timeout']) ? $options['timeout'] : null;
      $options['query']['token'] = $user->acquireToken($duration);

      try {
          $response = $this->send($this->createRequest($method, $url, $options));
          return $response;
      } catch (ApiException $exception) {
          // If the token is invalid, we should delete it from storage so that a
      // fresh token is fetched on the next request.
      if ($exception->getCode() == 401) {
          // Ensure the token will be deleted.
        $user->invalidateToken();
      }
          throw $exception;
      }
  }
}

before.php

<?php

class Client extends GuzzleClient implements ClientInterface {
  /**
   * {@inheritdoc}
   */
  public function authenticatedRequest($method = 'GET', $url = null, UserInterface $user, $options = []) {
    $duration = isset($options['timeout']) ? $options['timeout'] : NULL;
    $options['query']['token'] = $user->acquireToken($duration);

    try {
      $response = $this->send($this->createRequest($method, $url, $options));
      return $response;
    }
    catch (ApiException $exception) {
      // If the token is invalid, we should delete it from storage so that a
      // fresh token is fetched on the next request.
      if ($exception->getCode() == 401) {
        // Ensure the token will be deleted.
        $user->invalidateToken();
      }
      throw $exception;
    }
  }
}