Build a Referral Program for Indie SaaS with Stripe, Supabase, Resend

A developer shares a 4-file setup to add referral functionality to indie SaaS apps using Stripe coupons, Supabase, and Resend. The system tracks referrals from signup to conversion and rewards referrers automatically. Industry benchmarks suggest referral programs can drive 10-30% of new signups for early-stage tools.