{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://itemprism.com/examples/itemprism-seller-feed-schema.json",
  "title": "ITEMPRISM Seller Offer",
  "type": "object",
  "required": [
    "external_id",
    "title",
    "condition",
    "price",
    "currency",
    "availability",
    "product_url",
    "checked_at"
  ],
  "properties": {
    "external_id": { "type": "string", "minLength": 1, "maxLength": 200 },
    "title": { "type": "string", "minLength": 3, "maxLength": 500 },
    "description": { "type": "string", "maxLength": 5000 },
    "brand": { "type": ["string", "null"], "maxLength": 200 },
    "model": { "type": ["string", "null"], "maxLength": 200 },
    "gtin": { "type": ["string", "null"], "pattern": "^[0-9]{8,14}$" },
    "mpn": { "type": ["string", "null"], "maxLength": 200 },
    "category": { "type": ["string", "null"], "maxLength": 300 },
    "condition": {
      "type": "string",
      "enum": ["new", "open_box", "refurbished", "used", "as_is"]
    },
    "condition_notes": { "type": ["string", "null"], "maxLength": 2000 },
    "price": { "type": "number", "minimum": 0 },
    "shipping": { "type": "number", "minimum": 0, "default": 0 },
    "currency": { "type": "string", "pattern": "^[A-Z]{3}$" },
    "availability": {
      "type": "string",
      "enum": ["in_stock", "limited", "out_of_stock", "unknown"]
    },
    "stock_count": { "type": ["integer", "null"], "minimum": 0 },
    "image_url": { "type": ["string", "null"], "format": "uri" },
    "product_url": { "type": "string", "format": "uri" },
    "affiliate_url": { "type": ["string", "null"], "format": "uri" },
    "warranty": { "type": ["string", "null"], "maxLength": 1000 },
    "returns": { "type": ["string", "null"], "maxLength": 1000 },
    "checked_at": { "type": "string", "format": "date-time" }
  },
  "additionalProperties": true
}