{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/CartItem",
  "title": "CartItem",
  "type": "object",
  "properties": {
    "upc": {
      "type": "string",
      "description": "The Universal Product Code of the item."
    },
    "quantity": {
      "type": "integer",
      "description": "The quantity of the item.",
      "minimum": 1
    },
    "product_id": {
      "type": "string",
      "description": "The Instacart product identifier."
    }
  }
}