code: public FutureData<Token> getToken(String identity, String service) {
          FutureData<Token> future = new FutureData<>();
          URI uri = newParams().put("id", identity)
                  .forURL(config.newAPIEndpointURI(IDENTITY + "/" + identity + "/token/" + service));
          Request request = config.http().
                  GET(uri, new PageReader(newRequestCallback(future, new Token(), config)));
          performRequest(future, request);
          return future;
      }
docs: /*
  Fetch a token using it's service ID and it's Identity's ID
  
  @param identity the ID of the identity to query
  @param service  the service of the token to fetch
  @return The identity for the ID provided