{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://w3id.org/moochub/4.0.0/schemas/offer.json",
  "title": "Offer",
  "description": "A commercial offer for an educational program, course, or certification.",
  "type": "object",
  "properties": {
    "type": {
      "const": "Offer"
    },
    "price": {
      "type": "number",
      "minimum": 0,
      "description": "The price of the offer in the specified currency."
    },
    "priceCurrency": {
      "type": "string",
      "pattern": "^[A-Z]{3}$",
      "description": "The ISO 4217 currency code for the price."
    },
    "category": {
      "$ref": "https://w3id.org/moochub/4.0.0/schemas/offerCategory.json",
      "description": "Whether the offer covers the course, certification only, or both."
    },
    "paymentFrequency": {
      "$ref": "https://w3id.org/moochub/4.0.0/schemas/paymentFrequency.json",
      "description": "The payment frequency used by the MOOChub profile."
    },
    "availabilityStarts": {
      "type": "string",
      "format": "date-time",
      "description": "The RFC 3339 date-time at which the offer becomes available."
    },
    "availabilityEnds": {
      "type": "string",
      "format": "date-time",
      "description": "The RFC 3339 date-time at which the offer is no longer available."
    },
    "url": {
      "$ref": "https://w3id.org/moochub/4.0.0/schemas/url.json",
      "description": "A booking, checkout, enrollment, or access URL for this offer that differs from the main course URL."
    }
  },
  "required": ["type", "price", "priceCurrency", "category"]
}