{
  "endpoint": "POST /agentic_commerce/complete_checkout",
  "description": "ACP Complete Checkout - Process payment using SharedPaymentToken",
  "spec_version": "2026-01-30",
  "request": {
    "checkout_id": "string - Checkout session ID",
    "shared_payment_token": "string - Stripe SPT (spt_xxx) or vault token (vt_xxx)",
    "idempotency_key": "string - Unique key to prevent duplicate charges"
  },
  "response": {
    "checkout_id": "chk_demo_abc123",
    "status": "completed",
    "order_id": "ord_demo_xyz789",
    "payment": {
      "status": "succeeded",
      "amount": 9765,
      "currency": "usd",
      "payment_method": "spt_demo_token"
    },
    "confirmation": {
      "order_number": "LG-2026-001234",
      "estimated_delivery": "2026-02-18",
      "tracking_available": true
    },
    "completed_at": "2026-02-15T10:40:00Z"
  },
  "webhooks": {
    "order.created": "Sent when order is created",
    "order.paid": "Sent when payment succeeds",
    "order.fulfilled": "Sent when order ships"
  },
  "demo": true
}