def get_for_client(resource)
      logger.verbose("TokenRequest getting token for client for #{resource}.")
      request(GRANT_TYPE => GrantType::CLIENT_CREDENTIALS,
              RESOURCE => resource)
    end
def get_for_client(resource)
      logger.verbose("TokenRequest getting token for client for #{resource}.")
      request(GRANT_TYPE => GrantType::CLIENT_CREDENTIALS,
              RESOURCE => resource)
    end
Gets a token based solely on the clients credentials that were used to
 initialize the token request.

 @param String resource
   The resource for which the requested access token will provide access.
 @return TokenResponse