{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ModificationAdd",
  "title": "ModificationAdd",
  "type": "object",
  "required": [
    "inherited_from_id"
  ],
  "description": "An add-on or discount to add to a subscription.",
  "properties": {
    "inherited_from_id": {
      "type": "string",
      "description": "Identifier of the base add-on or discount definition to inherit from."
    },
    "amount": {
      "type": "string",
      "description": "Override the base amount for this add-on or discount on this subscription.",
      "example": "1.00"
    },
    "number_of_billing_cycles": {
      "type": "integer",
      "description": "Override the number of billing cycles for this add-on or discount.",
      "minimum": 1
    },
    "never_expires": {
      "type": "boolean",
      "description": "If true, override to apply this modification indefinitely."
    },
    "quantity": {
      "type": "integer",
      "description": "Number of times this add-on is applied per billing cycle.",
      "minimum": 1
    }
  }
}