{"protocol":{"name":"acp","version":"2026-04-17","supported_versions":["2026-04-17","2026-01-30","2025-12-12","2025-09-29"],"documentation_url":"https://github.com/ar-agents/ar-agents/tree/main/packages/agentic-commerce-bridge"},"api_base_url":"https://example.invalid","transports":["rest"],"capabilities":{"services":["checkout"]}}