If Spotify were integrating Sierra for its customer support chatbot, what would that technical system look like?

Focus on outlining the architecture of the integration between Spotify and Sierra, emphasizing key components such as data flow, APIs, and user interaction. Consider how the chatbot would handle user queries, including natural language processing capabilities and the backend systems required for data retrieval. Discuss potential challenges in integrating Sierra with Spotify's existing infrastructure, including scalability and security concerns. Highlight how you would ensure a seamless user experience while maintaining efficient support operations.