appwrite/docs/examples/1.8.x/server-ruby/examples/messaging/create-subscriber.md

require 'appwrite'

include Appwrite

client = Client.new
    .set_endpoint('https://<REGION>.cloud.appwrite.io/v1') # Your API Endpoint
    .set_project('<YOUR_PROJECT_ID>') # Your project ID
    .set_jwt('<YOUR_JWT>') # Your secret JSON Web Token

messaging = Messaging.new(client)

result = messaging.create_subscriber(
    topic_id: '<TOPIC_ID>',
    subscriber_id: '<SUBSCRIBER_ID>',
    target_id: '<TARGET_ID>'
)