Create Temporal billing sweep schedule, workflow and activities and
register them in the worker/start initialization. Add an HTMX preview
route and banner for plan switches (switch button now GETs a preview;
Confirm posts the switch). Extend the Stripe test mock to support
invoice previews and add integration tests for PreviewSwitch behavior.
Replace the order-dependent, payload-trusting webhook fulfillment with a single
idempotent ReconcileSubscription (internal/fulfillment) that refetches
authoritative subscription state from the Stripe API and converges core records
and pool entitlements via the plan-transitions primitive. checkout.session.completed
and customer.subscription.* become thin triggers; the post-checkout return path
reconciles eagerly. This fixes paid upgrades provisioning zero entitlement, caused
by reading the empty line_items the webhook payload never carries.
- internal/fulfillment: ReconcileSubscription + ReconcileLatestSubscriptionForCustomer,
advisory-locked, convergent/idempotent, with unit + DB-gated integration tests
- internal/stripetest: in-process stripe.Backend mock for offline reconcile tests
- thin webhook handlers; eager reconcile on /?checkout=success (best-effort)
- stripe.Key set process-wide before the Temporal worker starts (cmd/start.go)
- OpenSpec change stripe-fulfillment-reconcile; archive completed member-upgrade-flow
now that its paid-upgrade demonstration (§5.3) is satisfied
cgalo5758