Agentic Commerce: How AI Agents Buy Things

Letting software spend your money is not a shopping problem, it is a security problem. This cursus builds it properly. First, how a card payment actually works: the five parties, authorization versus settlement, interchange, and the tokenization idea everything rests on. Then the mechanism: scoped single-use payment tokens, signed intent and cart mandates, agent identity, and guardrails that bound what an agent may buy. Finally the unsettled parts: liability for an authorized mistake, merchant incentives, prompt injection at checkout, and why the forecasts disagree tenfold.