/**
  * {@inheritdoc}
  */
 public function check(OAuth2Token $token, OAuth2 $configuration)
 {
     if (null === $configuration->getResourceOwnerPublicId()) {
         return;
     }
     if ($configuration->getResourceOwnerPublicId() !== $token->getResourceOwner()->getPublicId()) {
         return 'Resource owner not authorized';
     }
 }