Perplexity AI has added shopping features to its generative AI-powered search engine to compete with Google and OpenAI's ChatGPT.Shopping-related search queries will now display product cards with images, pricing, and AI-generated summaries of key features and reviews.Pro users can purchase some items without leaving Perplexity, and a new merchant program allows sellers to share product information.Perplexity is currently raising investment at a valuation of $9bn and faces direct competition from OpenAI's ChatGPT.