{
  "$id": "https://commandlayer.org/schemas/v1.1.0/commercial/checkout/requests/checkout.request.schema.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "checkout.request",
  "description": "Request schema for initiating a commercial checkout operation (cart → order).",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "x402": {
      "description": "x402 envelope describing the checkout verb and version.",
      "allOf": [
        {
          "$ref": "https://commandlayer.org/schemas/v1.1.0/_shared/x402.schema.json"
        }
      ]
    },
    "trace": {
      "description": "Trace envelope for correlating this checkout with logs and receipts.",
      "allOf": [
        {
          "$ref": "https://commandlayer.org/schemas/v1.1.0/_shared/trace.schema.json"
        }
      ]
    },
    "payload": {
      "description": "Checkout-specific payload.",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "cart_id": {
          "description": "Optional logical cart identifier.",
          "type": "string",
          "maxLength": 128
        },
        "items": {
          "description": "Line items in the checkout cart.",
          "type": "array",
          "minItems": 1,
          "maxItems": 256,
          "items": {
            "type": "object",
            "additionalProperties": false,
            "required": ["sku", "quantity"],
            "properties": {
              "sku": {
                "description": "Stock keeping unit or product identifier.",
                "type": "string",
                "minLength": 1,
                "maxLength": 128
              },
              "quantity": {
                "description": "Quantity requested.",
                "type": "number",
                "minimum": 0.000001
              },
              "unit_price": {
                "description": "Optional unit price expectation for this item.",
                "allOf": [
                  {
                    "$ref": "https://commandlayer.org/schemas/v1.1.0/commercial/_shared/payment.amount.schema.json"
                  }
                ]
              },
              "metadata": {
                "description": "Optional per-item metadata.",
                "type": "object",
                "additionalProperties": true
              }
            }
          }
        },
        "amount": {
          "description": "Expected total amount for the checkout.",
          "allOf": [
            {
              "$ref": "https://commandlayer.org/schemas/v1.1.0/commercial/_shared/payment.amount.schema.json"
            }
          ]
        },
        "settlement": {
          "description": "Expected settlement destination for this checkout.",
          "allOf": [
            {
              "$ref": "https://commandlayer.org/schemas/v1.1.0/commercial/_shared/payment.settlement.schema.json"
            }
          ]
        },
        "shipping_address": {
          "description": "Optional shipping address for physical goods.",
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "name": { "type": "string", "maxLength": 256 },
            "line1": { "type": "string", "maxLength": 256 },
            "line2": { "type": "string", "maxLength": 256 },
            "city": { "type": "string", "maxLength": 128 },
            "state": { "type": "string", "maxLength": 128 },
            "postal_code": { "type": "string", "maxLength": 32 },
            "country": { "type": "string", "maxLength": 2 }
          }
        },
        "payment_method_hint": {
          "description": "Optional hint for what payment rail to use (card, stablecoin, on-chain, etc.).",
          "type": "string",
          "maxLength": 64
        },
        "metadata": {
          "description": "Optional non-normative metadata.",
          "type": "object",
          "additionalProperties": true
        }
      },
      "required": ["items", "amount", "settlement"]
    }
  },
  "required": ["x402", "trace", "payload"]
}