ChatKit usecase without frontend

[macro161]

I want to call ChatKit directly from my Java code. I successfully generated a secret, but I don't understand what I should do next?

public void callOpenAI() {
        OpenAIClient client = OpenAIOkHttpClient.builder()
                .fromEnv()
                .apiKey("key")
                .build();

        var param2 = ChatSessionWorkflowParam.builder().id("id").build();
        var params = SessionCreateParams.builder().user("name").workflow( param2).build();

        ChatSession chatSession = client.beta().chatkit().sessions().create(params);

        String secret = chatSession.clientSecret();
    }

I want to call ChatKit with an initial text to begin the agent workflow