{
  "endpoint": "POST /agentic_commerce/cancel_checkout",
  "description": "ACP Cancel Checkout - Release reserved inventory and cancel session",
  "spec_version": "2026-01-30",
  "request": {
    "checkout_id": "string - Checkout session ID",
    "reason": "string - Cancellation reason (optional)"
  },
  "response": {
    "checkout_id": "chk_demo_abc123",
    "status": "cancelled",
    "cancelled_at": "2026-02-15T10:45:00Z",
    "inventory_released": true
  },
  "demo": true
}