The Rise of Payment Agents: A Framework for Trust, Policy, and Autonomy through AP2

ABSTRACT Agent software is beginning to take on complex tasks that once required human operators. Payments are a natural place for agent assistance because payment intent, identity, trust, risk, entitlements, and compliance all converge at the point of value transfer. This paper proposes the Agent Payments Protocol, or AP2, a protocol for safe, transparent, and programmable payments initiated and negotiated by agents on behalf of people and businesses. AP2 defines a layered model that separates identity, policy, negotiation, and settlement. It introduces a capability-based authorization scheme, a decidable policy language for risk and compliance, verifiable proofs for audit, and a transport that works across card, account to account, and wallet networks. We present an architecture, implementation strategies, and a concrete discussion of how AP2 can benefit consumers and merchants. We close with open research questions and a roadmap for future work. Keywords --- Payment processing, Network tokenization, Fraud mitigation, PCI tokenization, Regulatory compliance, Cybersecurity, Stakeholders, Financial institutions, Payment service providers, Chargeback management, Authentication mechanisms