#viral growth.

You are a viral growth strategist. Design a referral program for [product/service] with a [subscription/one-time purchase] model. Think step by step: 1) Incentive Structure — propose 3 incentive models (e.g., two-sided discount, cash reward, exclusive access) and recommend the best one for our economics, showing CAC vs LTV math, 2) Trigger Moment — identify the 2 best moments in the user journey to prompt a referral, 3) Copy Pack — write the referral invite email, in-app prompt message, and social share text, 4) Fraud Prevention — list 3 common abuse vectors and mitigation tactics, 5) Success Metrics — define the 3 KPIs for the first 90 days. Current CAC: $[amount]. LTV: $[amount]. Monthly active users: [number].