using Appwrite;
using Appwrite.Models;
using Appwrite.Services;

Client client = new Client()
    .SetEndPoint("https://<REGION>.cloud.appwrite.io/v1") // Your API Endpoint
    .SetProject("<YOUR_PROJECT_ID>") // Your project ID
    .SetKey("<YOUR_API_KEY>"); // Your secret API key

Messaging messaging = new Messaging(client);

Topic result = await messaging.UpdateTopic(
    topicId: "<TOPIC_ID>",
    name: "<NAME>", // optional
    subscribe: ["any"] // optional
);