Apply A2A cross-cutting development patterns — orchestration topologies, idempotency, observability, agent registries, versioning, and production deployment. Use when architecting multi-agent systems or solving cross-cutting concerns.
Implement AP2 cryptographic signing — hardware-backed user signatures, merchant entity signatures, VDC integrity, key management, and attestation flows. Use when building the signing, verification, and key management components of AP2 mandates.
Apply AP2 cross-cutting development patterns — multi-agent payment architecture, UCP integration, x402 crypto payments, testing with mock providers, and production deployment. Use when architecting agentic payment systems or solving cross-cutting payment concerns.