node-appwrite/docs/examples/messaging/create-subscriber.md

Appwrite is an open-source self-hosted backend server that abstract and simplify complex and repetitive development tasks behind a very simple REST API

const sdk = require('node-appwrite');

const client = new sdk.Client()
    .setEndpoint('https://cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('5df5acd0d48c2') // Your project ID
    .setJWT('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ...'); // Your secret JSON Web Token

const messaging = new sdk.Messaging(client);

const result = await messaging.createSubscriber(
    '<TOPIC_ID>', // topicId
    '<SUBSCRIBER_ID>', // subscriberId
    '<TARGET_ID>' // targetId
);