/**
* setting up the oauth2 plugin for authorizing the requests
*/
private function setupOAuth2Plugin()
{
$oauth2AuthorizationClient = $this->resolveClient(null);
$oauth2AuthorizationClient->setBaseUrl(Properties::authorizationUrl());
$clientCredentials = new ClientCredentials($oauth2AuthorizationClient, $this->config->toArray());
$oauth2Plugin = new OAuth2Plugin($clientCredentials);
$oauth2Plugin->setCache($this->config->getAccessTokenCacheFile());
$this->client->addSubscriber($oauth2Plugin);
}
