- Accept checkout.session.async_payment_succeeded (async methods) and dedupe on
the checkout session id, not the event id.
- committedGb still counts a failed instance while its VM exists (has vmid);
releases quota only when no VM was created — no overcommit vs no leak.
- CloudReady is queued (durable). Credential delivery is documented at-least-once
(a rare duplicate welcome email beats a lost credential; exactly-once = v1.1 outbox).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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