Stop active subscribers from creating duplicate Polar checkouts - #48
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Repeated Polar sessions came from one active subscriber because checkout intent was recorded before entitlement verification and concurrent clicks were not guarded. Refresh entitlement before purchase creation, route active subscribers to their portal, enforce the same rule at the Worker boundary for older clients, and correlate checkout outcomes with stable attempt and provider IDs. Constraint: Existing macOS releases can call the Worker without the new client guard, so server enforcement is required. Constraint: Polar expiration and provider-status analytics require checkout.updated and checkout.expired webhook subscriptions. Rejected: Fix reporting only | Polar confirmed real duplicate checkout records, so deduplication alone would leave customer and billing risk. Confidence: high Scope-risk: moderate Reversibility: clean Directive: Keep active-subscription enforcement in the Worker even if client checkout UI changes. Tested: Wrangler production dry-run compile; Swift syntax parse; checkout-decision regression tests added; git diff --check Not-tested: Full Xcode test target because repository policy forbids terminal xcodebuild; live Polar webhook delivery until deployment and event subscription.
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Outcome:
Evidence:
Deployment note:
Enable Polar webhook events checkout.updated and checkout.expired after the Worker deployment so provider outcome events reach PostHog.