Track 1 · Core
Notifications
Login codes that never wait behind a campaign, providers that fail, and an SMS that must not go out twice.
Pro Medium 14 min guided 9 Checks
What you practice
The hard part is someone else's system: SMS and email providers go down, time out, and sometimes send without answering. You will keep login codes fast while a campaign goes out, retry without sending twice, and give every delivery a status.
This Exercise is part of Pro. The free Exercise and the Sandbox are open to everyone.