I need a custom plugin for my Shopify store that focuses solely on inventory management. The app must tap directly into Shopify’s API to keep stock levels accurate in real time and alert me whenever an item reaches a predefined threshold. Core scope • Real-time rastreamento de estoque through the Shopify API, updating quantities across all product variants without manual refreshes. • Notificações de reposição via email and optionally push or SMS when stock falls below a configurable level. Key details – Built for the current Shopify App Bridge and Admin API versions. – Clean, well-commented code in either Node.js or Ruby on Rails (I’m flexible if you prefer another stack that is Shopify-friendly). – All configuration screens must sit natively inside the Shopify admin with Polaris-styled UI components. – Webhook handling should be secure (HMAC verified) and resilient to retries. – Final hand-off includes source code in a private repo, a brief deployment guide, and a one-session walkthrough so I can extend minor tweaks myself later. Please factor in best practices for performance and Shopify app review guidelines; the goal is to publish this privately at first and potentially list it in the public App Store once it’s battle-tested.