Shopify Apps Expert patterns for Shopify app development including Remix/React Router apps, embedded apps with App Bridge, webhook handling, GraphQL Admin API, Polaris components, billing, and app extensions. <!-- Modified 2026-10-23: deployment and tenant/privacy boundaries; Apache-2.0 retained. -- Integration limits Use the authorized development store/app, minimum scopes and protected-customer-data approvals; accessScopes does not prove protected-data approval. These legacy Remix/2024 API snippets are incomplete and require current generated SDK/template/schema validation. Test billing wit…