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Hardcoding a payment provider into dozens of files creates a refactor bill that runs into weeks when you need to switch. The adapter pattern centralizes all provider logic behind one interface, so swapping Stripe for Lemon Squeezy means changing one env var — not 40 files. Vibe44 ships this abstraction pre-built, covering Stripe, Lemon Squeezy, Polar, Dodo, and Creem with normalized webhooks across all five.

The data model you pick on day one decides whether multi-tenancy is a weekend or a quarter. Shared-schema with row-level security scales to thousands of tenants on one database; schema-per-tenant and DB-per-tenant trade that simplicity for operational weight you pay forever. Vibe44 ships shared-schema multi-tenancy by default.

Building the undifferentiated foundation of a SaaS — authentication, multi-tenant data, billing, security, and observability — costs a senior engineer roughly 480 hours (about 12 weeks) and ~$36,000 of time no customer will ever pay you for. A production-grade Next.js boilerplate ships that same foundation for a $197 one-time license: 32 tables protected by row-level security, Universal Payment and AI adapters, and OWASP Top 10 (2025)-aligned hardening on day one.

Building for AI LLMs like ChatGPT, Claude, Perplexity, etc. isn't about keyword density; it's about making your architecture structurally sound for AI consumption. With ChatGPT processing 250–500M weekly queries and capturing ~17% of global digital query share, SaaS founders who don't architect for answer engines are invisible to the next generation of buyers.

Shipping a Next.js SaaS to real, paying, hostile users takes more than a green build. This checklist enumerates 27 concrete things — across security and data, payments and billing, and observability and testing — that stand between a demo and production. Vibe44 ships most of the 27 by default, backed by RLS across 32 tables, 900 Vitest unit tests, and 9 Playwright E2E suites.

The OWASP Top 10:2025 is the 8th installment of the list, and it changes the game for SaaS teams: it adds two brand-new categories — A03 Software Supply Chain Failures and A10 Mishandling of Exceptional Conditions — and folds SSRF into A01 Broken Access Control. This post maps all ten risks to a concrete, verifiable Next.js control. Vibe44 ships that coverage out of the box.