new protocol

Added AP2 with the A2A layer distinction

Added the Agent Payments Protocol (AP2) as a payment-authorization layer and clarified that A2A is agent-communication only — payments ride on top via other protocols. Logged the PayPal-with-Google AP2 pilot.

ap2a2aap2-paypal-pilot

  1. [1]Powering AI commerce with the new Agent Payments Protocol (AP2)— Google Cloud, 2025-09-16