Drop-in React Server Actions & webhook signature verifier
Add checkout triggers, subscription paywalls, and cryptographic webhook handlers to any Next.js 16 / React 19 application in minutes.
Every module is structured for maintainability, type safety, and zero bloat.
Generate checkout sessions directly from React Server Actions.
Pre-configured `app/api/webhooks/billing/route.ts` with signature check.
Protect server components and routes with active subscription checks.
Clean, modular file organization designed to integrate into your existing project in minutes.
nextjs-billing-module/
├── actions/checkout.ts # React Server Action for checkouts
├── api/route.ts # Next.js 16 App Router webhook handler
├── lib/verifier.ts # Cryptographic signature validator
└── middleware/gate.ts # Route paywall middlewareProduction-grade payment processing with cryptographic Svix webhook verification.
Pre-configured signature verification handler for order.created, customer.subscribed, and refund events.
Buyers can manage invoices, upgrade license seats, and access updated repositories anytime.
Instant automated repository invitation via Polar.sh with continuous git pull version updates.
Every starter kit and UI primitive adheres to strict engineering benchmarks.
End-to-End Strict TypeScript & Dart
Verified Webhook Security
Clean, Modular Architecture
Continuous Maintenance
Everything you need to know about licensing, setup, and support.
DevPreFlight provides production-grade starter kits and boilerplates categorized into 3 distinct tiers: Tier 1 (Micro Modules, $19-$29) for single-purpose utilities like webhook handlers or UI kits; Tier 2 (Core Feature Kits, $49-$69) for core auth, payment, and database setups; and Tier 3 (The All-in-One Mega Starter Kit, $99-$149) for complete full-stack SaaS boilerplates with lifetime updates and instant GitHub repository access.