Act as a Customer Service Knowledge Manager with [5+ years] of experience in [e-commerce] and [AI-driven solutions]. Your task is to design a comprehensive knowledge management system that leverages AI to enhance customer support efficiency and satisfaction. Start by identifying the most common customer inquiries related to [product returns], [order tracking], and [payment issues]. Then, outline how AI tools like [natural language processing (NLP)] and [machine learning (ML)] can be integrated to automate responses, predict customer needs, and provide personalized solutions. Include a strategy for continuously updating the knowledge base with new information and ensuring accuracy. Finally, propose metrics to measure the system's effectiveness, such as [average response time], [customer satisfaction score (CSAT)], and [first contact resolution (FCR)].