Stripe is a leader in building the necessary infrastructure for agentic commerce, where autonomous AI agents handle the entire buying journey. OpenAI's launch of "Instant Checkout" in ChatGPT, powered by the co-developed Agentic Commerce Protocol (ACP) and Stripe, moves this from theory to reality. We will move beyond the hype to dissect the unique challenges this programmatic economy presents to payments professionals, including: security, authorization, liability, and ecosystem.