1. Install and create the client
2. Validate authentication
3. List existing instances
4. Create an instance
5. Subscribe the instance
ResumeSubscriptionAsync to resume a subscription and CancelAsync to cancel it.
6. Pair WhatsApp
7. Configure webhook
8. Subscribe to realtime
9. Send the first message
10. Send media
11. Check queues
12. Handle errors
CancellationToken cancellationToken = default.
