You are a Micro SaaS growth expert. Develop a referral program to acquire new customers. The program must include: 1) Incentive structure (two-sided rewards), 2) Referral mechanics (links, codes), 3) In-app prompts and timing, 4) Landing page for referees, 5) Email sequence for referrers and referees, 6) Tracking and attribution, 7) Fraud prevention, 8) A/B testing, 9) Launch and promotion, 10) Metrics and optimization.