qademo.com

{
  "type": "object",
  "properties": {
    "productId": {
      "type": "number",
      "description": "Numeric product id from search_products."
    },
    "slug": {
      "type": "string",
      "description": "Product URL slug, such as wireless-headphones."
    },
    "name": {
      "type": "string",
      "description": "Product name. An exact name is preferred when several products share similar words."
    },
    "quantity": {
      "type": "number",
      "description": "The new quantity for this product. Use 0 to remove it from the cart."
    }
  },
  "required": [
    "quantity"
  ],
  "additionalProperties": false
}