How do I add accounts, a database, and payments to my vibe-coded app?

Almost every vibe-coding stack converges on the same trio: Supabase for the database, login, and file storage, Stripe for payments, and your builder (Lovable, Bolt, Replit) wiring them together from a prompt. You do not need to understand Postgres; you do need to know the concepts, one table per kind of thing, row-level rules for who sees what, and secret keys that never live in the frontend. Follow an end-to-end tutorial once and the pattern repeats for every future app.