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Build a full-stack embedded Shopify App using the official Shopify Remix App Template to implement a paid VIP membership program.

1. DATA MODEL & SETUP
- Define database models for MembershipTier (id, name, price, billingInterval, storeCreditAmount, memberTag, shopifySellingPlanId) and MemberSubscription (id, shopifyCustomerId, shopifySubscriptionContractId, status, currentPeriodEnd).
- Connect to Shopify Admin GraphQL API using app session tokens.

2. CORE FUNCTIONALITY
- Billing: Create a Shopify Selling Plan Group for the VIP membership via Admin GraphQL API. When a customer purchases the membership product, create a Subscription Contract.
- Webhooks: Listen for `SUBSCRIPTION_CONTRACTS_UPDATE` and `SUBSCRIPTION_BILLING_ATTEMPTS_SUCCESS`. On successful payment, trigger a GraphQL mutation to the Shopify Store Credit API (`storeCreditAccountCredit`) to grant the configured store credit amount to the customer.
- Member Status Management: On subscription activation, add the designated customer tag (e.g., 'vip-member') and set a customer metafield `vip.status = active`. On subscription cancellation or payment failure, remove the tag and update metafield `vip.status = inactive`.
- Theme Integration: Provide a Theme App Extension (Liquid block & JS) displaying current membership status and remaining store credit balance on the customer account page.
- Perks Logic: Generate a Shopify Function (Order Discount / Delivery Option Customization) that checks if the logged-in customer has `vip.status = active`. If active, automatically apply a designated percentage discount and enforce free shipping.

3. FAILURE MODES & EDGE CASES
- Handle `SUBSCRIPTION_BILLING_ATTEMPTS_FAILURE`: Retry logic, set status to past_due, send email notification event, and withhold store credit.
- Prevent duplicate credit issuance by storing the `billingAttemptId` in idempotency logs before making the store credit API call.
- Ensure non-members cannot manually trigger member discounts by relying strictly on authenticated checkout customer contexts inside Shopify Functions.

4. OUT OF SCOPE
- Do not build third-party payment gateway connectors outside of Shopify Billing API.
- Exclude complex manual rewards catalog; focus strictly on automated store credit disbursement and cart-level discounts.

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