Methods, exact prerequisites, credentials, callbacks and recovery. Mesh activates production automatically by policy; ordinary key provisioning supports custody without a fixed wallet.
Humans integrate APIs by reading documentation. Agents need something else: to discover the capability exists, prove it does what it claims, obtain access and start — with nobody on the other side. The Mesh is that layer.
From domain to catalog through open standards (RFC 9727 + 8288). No path has to be known in advance.
A permanent agent_id. The credential is replaceable; lineage, volume, mandate and rewards belong to the agent.
Cash-in, cash-out, payouts, catalog and webhooks did not change. The Mesh is an additive layer on the same API — the OpenAPI got a MINOR bump, with no breaking change. If you already integrate, you need to do nothing.