StoreFleet Shopify App Kit

StoreFleet's Shopify app kit is the Go and React source code behind more than 20 production apps. Key features: • Shopify sign-in with token exchange and sealed session tokens • Webhook handling and GDPR data request handlers • Subscription plans built on the Shopify Billing API • Merchant email and PDF document generation • React admin interface built with Polaris web components • Theme and admin extension kit, plus an MCP server The kit covers the foundations every embedded Shopify app needs, so your team does not have to rebuild sign-in, billing, webhooks, or compliance handlers from scratch. Instructions and skill files for coding agents tell them how the codebase is organized, so they can add features that follow the existing patterns. Your agent can focus on the logic that makes your app different. The Go backend and React admin are structured so each feature stays isolated and easy to extend. Billing gates can be applied to individual handlers, database migrations are numbered and ready to run, and settings pages reuse the shared UI system. If you would rather not build the features yourself, StoreFleet can build your app on top of the kit. This kit suits Shopify developers, agencies, and merchants with in-house engineers who want to launch a custom embedded app quickly without starting from zero. It is especially useful for teams that plan to ship several apps on a common foundation.