{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://ucp.dev/2026-04-08/schemas/shopping/types/fulfillment_event.json",
  "title": "Fulfillment Event",
  "description": "Append-only fulfillment event representing an actual shipment. References line items by ID.",
  "type": "object",
  "required": [
    "id",
    "occurred_at",
    "type",
    "line_items"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Fulfillment event identifier."
    },
    "occurred_at": {
      "type": "string",
      "format": "date-time",
      "description": "RFC 3339 timestamp when this fulfillment event occurred."
    },
    "type": {
      "type": "string",
      "description": "Fulfillment event type. Common values include: processing (preparing to ship), shipped (handed to carrier), in_transit (in delivery network), delivered (received by buyer), failed_attempt (delivery attempt failed), canceled (fulfillment canceled), undeliverable (cannot be delivered), returned_to_sender (returned to merchant)."
    },
    "line_items": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "quantity"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Line item ID reference."
          },
          "quantity": {
            "type": "integer",
            "minimum": 1,
            "description": "Quantity fulfilled in this event."
          }
        }
      },
      "description": "Which line items and quantities are fulfilled in this event."
    },
    "tracking_number": {
      "type": "string",
      "description": "Carrier tracking number (required if type != processing)."
    },
    "tracking_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to track this shipment (required if type != processing)."
    },
    "carrier": {
      "type": "string",
      "description": "Carrier name (e.g., 'FedEx', 'USPS')."
    },
    "description": {
      "type": "string",
      "description": "Human-readable description of the shipment status or delivery information (e.g., 'Delivered to front door', 'Out for delivery')."
    }
  }
}