code: public String createToken(int ttl) {
          checkArgument(ttl > 0);
  
          CreateTokenRequest request = new CreateTokenRequest();
          request.setTtl(ttl);
          InternalRequest internalRequest = createRequest(request, HttpMethodName.POST, null, TOKEN);
          CreateTokenResponse response = this.invokeHttpClient(internalRequest, CreateTokenResponse.class);
          return response.getToken();
      }
docs: Create a token
  @param ttl - token's time to live, in seconds
  @return a string token