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Build a light-weight Shopify Subscription Management service using Node.js, Express, and the Shopify GraphQL Admin API (Subscription Contracts).

1. DATA MODEL:
- Store subscriptions with fields: ID, shopify_subscription_contract_id, customer_id, status (ACTIVE, PAUSED, CANCELLED), frequency_unit (DAY, WEEK, MONTH), frequency_value (number), next_billing_date, line_items (variant_id, quantity, price).
- Store billing_attempts with fields: ID, subscription_id, status (SUCCESS, FAILED), error_code, attempted_at.

2. CORE FUNCTIONALITY:
- Webhook endpoint for 'subscription_contracts/create' and 'subscription_contracts/update' to keep backend in sync.
- Cron worker running daily to query upcoming charges, trigger 'subscriptionBillingAttemptCreate' via Shopify GraphQL API, and update local state.
- Customer Self-Service API endpoints embedded via Shopify App Proxy:
  a) GET /api/portal/subscription?customer_id=X: returns active contracts.
  b) POST /api/portal/pause: pauses contract via GraphQL 'subscriptionContractPause'.
  c) POST /api/portal/skip: advances 'next_billing_date' by one cycle.
  d) POST /api/portal/swap: updates variant_id on active contract line item.

3. FAILURE MODES & RETRIES:
- Handle billing attempt failures: if payment fails, queue a dunning retry sequence at +3 days, +7 days, +14 days.
- Send webhook payload to Klaviyo/email engine on second failed attempt with a link to update payment credentials.
- If final retry fails, set local state and Shopify contract status to CANCELLED.
- Idempotency handling: ensure cron job uses atomic database locks so billing attempts are never executed twice for the same billing date.

4. OUT OF SCOPE:
- Custom payment gateway integration (use Shopify's vaulted payment handles).
- Multi-currency conversion engines.
- Physical order shipping and fulfillment routing.

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