Analyze the role of referral programs in driving product growth for [PRODUCT_NAME], a [PRODUCT_TYPE] in the [INDUSTRY] sector. Detail how referral incentives (e.g., [DISCOUNT_TYPE], [REWARD_TYPE], or [TIERED_REWARDS]) can influence customer acquisition, retention, and virality. Provide a step-by-step framework for designing, implementing, and optimizing a referral program, including key metrics (e.g., [KPI_1], [KPI_2]) to track success. Highlight common pitfalls (e.g., [COMMON_MISTAKE_1], [COMMON_MISTAKE_2]) and how to avoid them. Use case studies from similar products to support your recommendations.