I will supabase, stripe, calendly integration for worldgroove

What needs to be built (simple): All Stripe payment links are already created for each teacher and each plan (3 / 6 / 12 months). These just need to be embedded/connected, not rebuilt. When a student pays via Stripe, save basic info in Supabase (name, email, teacher, plan length). Supabase should track how many lessons the student has purchased and how many remain. Each time a lesson is booked/completed (via Calendly), the remaining lesson count is reduced automatically. Frontend/UI is already done. This is backend integration and logic only.