Knock has developed an automated lifecycle marketing loop using their notification infrastructure and in-app messaging product, Knock Guides, to streamline customer feedback and advocacy processes. By targeting high-activity users with an in-app NPS survey, the workflow collects meaningful feedback, which is stored and segmented for personalized follow-ups. The system automatically sends tailored emails based on NPS scores, encouraging promoters to leave reviews and gathering additional insights from other users. This approach eliminates manual tracking and outreach, enhancing engagement and efficiency. The project highlights the effectiveness of behavior-triggered messaging, centralized user data, and the benefits of using in-app communication to boost customer interaction. Knock's internal use of this system demonstrates its capability to power various feedback-driven campaigns, proving its flexibility and intuitiveness for both developers and marketers.