How to build a SaaS application with authentication and payment processing using Next.js

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Build production-ready SaaS apps 10x faster with NextDevKit, a full-stack template using Next.js & OpenNext with auth, payment, landing page, email, storage, blog, docs, and database & native support for Vercel, Cloudflare Workers(D1, KV, R2), and AWS(Lambda, RDS).

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What to expect from an ideal product

1. Provides pre-built authentication system that handles user registration, login, and session management without writing complex auth code from scratch
2. Includes ready-to-use payment processing integration that connects with popular payment providers, eliminating the need to build billing systems manually
3. Offers a complete Next.js template with all SaaS essentials like user dashboards, subscription management, and account settings already configured
4. Ships with database schemas and API routes specifically designed for SaaS applications, so you don't have to architect the backend infrastructure yourself
5. Supports multiple deployment platforms including Vercel, Cloudflare Workers, and AWS, giving you flexibility to host your SaaS application anywhere