Persist nextBillingDate on subscription create/update; unset on
cancel or downgrade to free. Account page displays the cached
date and lazily refreshes from Helcim when the cached value is
within 24h of now (or missing).
- listHelcimCustomerTransactions(customerCode): GET /card-transactions/
with customerCode filter, sorts newest-first, caps at 50, normalizes
Helcim status (APPROVED/DECLINED) + type (refund) into
paid/refunded/failed/other.
- updateHelcimCustomerDefaultPaymentMethod(customerId, cardToken):
resolves cardToken -> cardId via /customers/{id}/cards, then PATCHes
/customers/{id}/cards/{cardId}/default.
- updateHelcimSubscriptionPaymentMethod(subscriptionId, cardToken):
wraps updateHelcimSubscription with a cardToken payload.
- helcimUpdateCardSchema: Zod schema { cardToken: string } for the
upcoming /api/helcim/update-card route.
- Unit tests for all three helpers (success + error paths).
helcimFetch called response.json() unconditionally, which threw
"Unexpected end of JSON input" on Helcim's 204 No Content responses
(e.g. DELETE /subscriptions/:id). The error was silently swallowed by
the best-effort cancel path in cancel-subscription, masking cases where
the Helcim-side cancel actually succeeded.
Moves updateHelcimSubscription to the live-verified wrapped shape
(PATCH /subscriptions { subscriptions: [{ id, ...payload }] }), adds a prior-
status check so sendWelcomeEmail only fires on pending_payment to active
transitions, short-circuits get-or-create-customer when a valid
helcimCustomerId is already on file, and replaces member.save() Slack-status
writes with findByIdAndUpdate({ runValidators: false }) to avoid save-time
validator pitfalls.
