A new ChatGPT checkout could push more shopping into AI conversations -- and both commerce platforms want in.E-commerce just took a step further into artificial intelligence (AI). On Monday, OpenAI announced that U.S. users can now buy from U.S. Etsy (ETSY -10.70%) sellers directly inside ChatGPT, with support for more than one million Shopify (SHOP -0.22%) merchants "coming soon." The experience -- called Instant Checkout -- keeps shoppers in the conversation from discovery to payment and was co-developed ...