Agentic commerce is reshaping how brands engage with consumers, moving away from marketing arbitrage to a focus on product truth. This shift transforms organic search from a cheap traffic source to a critical gatekeeper for AI validation. In this new environment, marketing-first brands struggle, while those that prioritize accurate product data thrive. Key players like ChatGPT, Microsoft Copilot, and Google are integrating direct checkout features, making traditional website visits less necessary. This has implications for how businesses manage their product feeds and customer relationships. The concept of autonomous purchasing is overstated; high-value items like cars or flights are too complex for agents to handle reliably, while low-cost items are often already automated through subscriptions. Instead, "conversational commerce" provides a superior search experience by synthesizing product data and user feedback, reducing the purchasing journey from 14 clicks to just a couple. The transition to headless commerce, powered by protocols like OpenAI's Agentic Commerce Protocol (ACP) and Google's Universal Commerce Protocol (UCP), emphasizes data optimization over website design. Merchants must ensure their API-accessible information is accurate and up to date, or risk being overlooked by AI-driven platforms. Merchants face strategic dilemmas in this new landscape. Using ChatGPT can provide access to a large user base but sacrifices customer relationships and email marketing rights. Conversely, Google allows for better customer retention but increases competition among brands. The shift to conversational commerce disrupts affiliate marketing as AI systems synthesize reviews without driving traffic, potentially leading to a decline in affiliate-generated content. Amazon, while dominant in pricing and logistics, confronts a conflict between its thin retail margins and reliance on advertising revenue, which could erode if the purchasing process simplifies. Google appears well-positioned to adapt, leveraging higher conversion rates while maintaining ad revenue through AI integration.