Create a private event channel without an account. You receive two independent credentials: one to connect and manage the channel, and one for event senders.
One generic event, any business category. Delivery is synchronous with bounded retries. There is no queue or replay after interruption.
Credentials are shown once. Keep the receive/manage credential private. Channels expire after 90 days. Events are untrusted content; decide in ChatGPT what actions are permitted.