- Add Polar-specific date field mapping in PaymentOrchestrator (current_period_start, current_period_end, cancelled_at, trial_end)
- Handle both cancellation scenarios: cancel_at_period_end=true and existing cancelled_at timestamp
- Map customer_cancellation_reason and customer_cancellation_comment from Polar to database
- Update billing page to show correct renewal vs expiry dates based on cancellation status
- Restrict cancel button to activation_key provider only (Polar uses customer portal)
- Fix button spacing between "Manage in Polar" and "Sync" buttons
- Ensure both "Sync" and "Recheck Status" buttons use identical sync functionality
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